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Finding the Fourth Proportional to 81,187.80, 121,781.70 and 72,634.20

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Solution

The fourth proportional to 81,187.80, 121,781.70 and 72,634.20 is: 108,951.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,187.80 : 121,781.70 = 72,634.20 : x
  2. Step 2: Convert to fraction form
    81,187.80/121,781.70 = 72,634.20/x
  3. Step 3: Cross multiply
    81,187.80x = 121,781.70 × 72,634.20
  4. Step 4: Simplify right side
    81,187.80x = 8,845,516,354.14
  5. Step 5: Solve for x
    x = 8,845,516,354.14/81,187.80
  6. Step 6: Final answer
    x = 108,951.30

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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.