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Finding the Fourth Proportional to 80,572.80, 120,859.20 and 71,587.20

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Solution

The fourth proportional to 80,572.80, 120,859.20 and 71,587.20 is: 107,380.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,572.80 : 120,859.20 = 71,587.20 : x
  2. Step 2: Convert to fraction form
    80,572.80/120,859.20 = 71,587.20/x
  3. Step 3: Cross multiply
    80,572.80x = 120,859.20 × 71,587.20
  4. Step 4: Simplify right side
    80,572.80x = 8,651,971,722.24
  5. Step 5: Solve for x
    x = 8,651,971,722.24/80,572.80
  6. Step 6: Final answer
    x = 107,380.80

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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.