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Finding the Fourth Proportional to 86,581.80, 129,872.70 and 72,001.80

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Solution

The fourth proportional to 86,581.80, 129,872.70 and 72,001.80 is: 108,002.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,581.80 : 129,872.70 = 72,001.80 : x
  2. Step 2: Convert to fraction form
    86,581.80/129,872.70 = 72,001.80/x
  3. Step 3: Cross multiply
    86,581.80x = 129,872.70 × 72,001.80
  4. Step 4: Simplify right side
    86,581.80x = 9,351,068,170.86
  5. Step 5: Solve for x
    x = 9,351,068,170.86/86,581.80
  6. Step 6: Final answer
    x = 108,002.70

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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.