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Finding the Fourth Proportional to 71,957.40, 99,301.31 and 39,691.30

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Solution

The fourth proportional to 71,957.40, 99,301.31 and 39,691.30 is: 54,774.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,957.40 : 99,301.31 = 39,691.30 : x
  2. Step 2: Convert to fraction form
    71,957.40/99,301.31 = 39,691.30/x
  3. Step 3: Cross multiply
    71,957.40x = 99,301.31 × 39,691.30
  4. Step 4: Simplify right side
    71,957.40x = 3,941,397,936.58
  5. Step 5: Solve for x
    x = 3,941,397,936.58/71,957.40
  6. Step 6: Final answer
    x = 54,774.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.