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Finding the Fourth Proportional to 87,612.80, 131,419.20 and 72,060.80

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Solution

The fourth proportional to 87,612.80, 131,419.20 and 72,060.80 is: 108,091.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,612.80 : 131,419.20 = 72,060.80 : x
  2. Step 2: Convert to fraction form
    87,612.80/131,419.20 = 72,060.80/x
  3. Step 3: Cross multiply
    87,612.80x = 131,419.20 × 72,060.80
  4. Step 4: Simplify right side
    87,612.80x = 9,470,172,687.36
  5. Step 5: Solve for x
    x = 9,470,172,687.36/87,612.80
  6. Step 6: Final answer
    x = 108,091.20

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1.5x scale

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.