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Finding the Fourth Proportional to 290,304,892.80, 435,656,404.80 and 128,862,691.20

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Solution

The fourth proportional to 290,304,892.80, 435,656,404.80 and 128,862,691.20 is: 193,382,399.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,304,892.80 : 435,656,404.80 = 128,862,691.20 : x
  2. Step 2: Convert to fraction form
    290,304,892.80/435,656,404.80 = 128,862,691.20/x
  3. Step 3: Cross multiply
    290,304,892.80x = 435,656,404.80 × 128,862,691.20
  4. Step 4: Simplify right side
    290,304,892.80x = 56,139,856,761,044,600
  5. Step 5: Solve for x
    x = 56,139,856,761,044,600/290,304,892.80
  6. Step 6: Final answer
    x = 193,382,399.52

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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.