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Finding the Fourth Proportional to 80,123.92, 120,135 and 42,660.88

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Solution

The fourth proportional to 80,123.92, 120,135 and 42,660.88 is: 63,964.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,123.92 : 120,135 = 42,660.88 : x
  2. Step 2: Convert to fraction form
    80,123.92/120,135 = 42,660.88/x
  3. Step 3: Cross multiply
    80,123.92x = 120,135 × 42,660.88
  4. Step 4: Simplify right side
    80,123.92x = 5,125,064,818.80
  5. Step 5: Solve for x
    x = 5,125,064,818.80/80,123.92
  6. Step 6: Final answer
    x = 63,964.23

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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.