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Finding the Fourth Proportional to 60,420.80, 90,631.20 and 20,981.90

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Solution

The fourth proportional to 60,420.80, 90,631.20 and 20,981.90 is: 31,472.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,420.80 : 90,631.20 = 20,981.90 : x
  2. Step 2: Convert to fraction form
    60,420.80/90,631.20 = 20,981.90/x
  3. Step 3: Cross multiply
    60,420.80x = 90,631.20 × 20,981.90
  4. Step 4: Simplify right side
    60,420.80x = 1,901,614,775.28
  5. Step 5: Solve for x
    x = 1,901,614,775.28/60,420.80
  6. Step 6: Final answer
    x = 31,472.85

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Similar ratio
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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.