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Finding the Fourth Proportional to 21,138,086.70, 31,707,130.05 and 21,138,086.70

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Solution

The fourth proportional to 21,138,086.70, 31,707,130.05 and 21,138,086.70 is: 31,707,130.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138,086.70 : 31,707,130.05 = 21,138,086.70 : x
  2. Step 2: Convert to fraction form
    21,138,086.70/31,707,130.05 = 21,138,086.70/x
  3. Step 3: Cross multiply
    21,138,086.70x = 31,707,130.05 × 21,138,086.70
  4. Step 4: Simplify right side
    21,138,086.70x = 670,228,064,005,075.38
  5. Step 5: Solve for x
    x = 670,228,064,005,075.38/21,138,086.70
  6. Step 6: Final answer
    x = 31,707,130.05

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Double scale
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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.