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Finding the Fourth Proportional to 60,520.80, 90,781.20 and 21,081.90

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Solution

The fourth proportional to 60,520.80, 90,781.20 and 21,081.90 is: 31,622.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,520.80 : 90,781.20 = 21,081.90 : x
  2. Step 2: Convert to fraction form
    60,520.80/90,781.20 = 21,081.90/x
  3. Step 3: Cross multiply
    60,520.80x = 90,781.20 × 21,081.90
  4. Step 4: Simplify right side
    60,520.80x = 1,913,840,180.28
  5. Step 5: Solve for x
    x = 1,913,840,180.28/60,520.80
  6. Step 6: Final answer
    x = 31,622.85

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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.