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Finding the Fourth Proportional to 1,275,431,143.80, 1,910,123,406.90 and 1,275,431,143.80

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Solution

The fourth proportional to 1,275,431,143.80, 1,910,123,406.90 and 1,275,431,143.80 is: 1,910,123,406.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275,431,143.80 : 1,910,123,406.90 = 1,275,431,143.80 : x
  2. Step 2: Convert to fraction form
    1,275,431,143.80/1,910,123,406.90 = 1,275,431,143.80/x
  3. Step 3: Cross multiply
    1,275,431,143.80x = 1,910,123,406.90 × 1,275,431,143.80
  4. Step 4: Simplify right side
    1,275,431,143.80x = 2,436,230,881,661,619,712
  5. Step 5: Solve for x
    x = 2,436,230,881,661,619,712/1,275,431,143.80
  6. Step 6: Final answer
    x = 1,910,123,406.90

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Double scale
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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.