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Finding the Fourth Proportional to 72,642.77, 108,761.14 and 39,243.17

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Solution

The fourth proportional to 72,642.77, 108,761.14 and 39,243.17 is: 58,755.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,642.77 : 108,761.14 = 39,243.17 : x
  2. Step 2: Convert to fraction form
    72,642.77/108,761.14 = 39,243.17/x
  3. Step 3: Cross multiply
    72,642.77x = 108,761.14 × 39,243.17
  4. Step 4: Simplify right side
    72,642.77x = 4,268,132,080.21
  5. Step 5: Solve for x
    x = 4,268,132,080.21/72,642.77
  6. Step 6: Final answer
    x = 58,755.09

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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.