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Finding the Fourth Proportional to 1,238,800,809.90, 1,858,201,214.85 and 687,802,781.10

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Solution

The fourth proportional to 1,238,800,809.90, 1,858,201,214.85 and 687,802,781.10 is: 1,031,704,171.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238,800,809.90 : 1,858,201,214.85 = 687,802,781.10 : x
  2. Step 2: Convert to fraction form
    1,238,800,809.90/1,858,201,214.85 = 687,802,781.10/x
  3. Step 3: Cross multiply
    1,238,800,809.90x = 1,858,201,214.85 × 687,802,781.10
  4. Step 4: Simplify right side
    1,238,800,809.90x = 1,278,075,963,417,228,544
  5. Step 5: Solve for x
    x = 1,278,075,963,417,228,544/1,238,800,809.90
  6. Step 6: Final answer
    x = 1,031,704,171.65

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.