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Finding the Fourth Proportional to 79,711.10, 109,985.20 and 60,585.80

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Solution

The fourth proportional to 79,711.10, 109,985.20 and 60,585.80 is: 83,596.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,711.10 : 109,985.20 = 60,585.80 : x
  2. Step 2: Convert to fraction form
    79,711.10/109,985.20 = 60,585.80/x
  3. Step 3: Cross multiply
    79,711.10x = 109,985.20 × 60,585.80
  4. Step 4: Simplify right side
    79,711.10x = 6,663,541,330.16
  5. Step 5: Solve for x
    x = 6,663,541,330.16/79,711.10
  6. Step 6: Final answer
    x = 83,596.15

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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.