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Finding the Fourth Proportional to 72,691.80, 109,037.70 and 60,007.20

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Solution

The fourth proportional to 72,691.80, 109,037.70 and 60,007.20 is: 90,010.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,691.80 : 109,037.70 = 60,007.20 : x
  2. Step 2: Convert to fraction form
    72,691.80/109,037.70 = 60,007.20/x
  3. Step 3: Cross multiply
    72,691.80x = 109,037.70 × 60,007.20
  4. Step 4: Simplify right side
    72,691.80x = 6,543,047,071.44
  5. Step 5: Solve for x
    x = 6,543,047,071.44/72,691.80
  6. Step 6: Final answer
    x = 90,010.80

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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.