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Finding the Fourth Proportional to 129,369.92, 178,530.16 and 72,781.32

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Solution

The fourth proportional to 129,369.92, 178,530.16 and 72,781.32 is: 100,438.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,369.92 : 178,530.16 = 72,781.32 : x
  2. Step 2: Convert to fraction form
    129,369.92/178,530.16 = 72,781.32/x
  3. Step 3: Cross multiply
    129,369.92x = 178,530.16 × 72,781.32
  4. Step 4: Simplify right side
    129,369.92x = 12,993,660,704.61
  5. Step 5: Solve for x
    x = 12,993,660,704.61/129,369.92
  6. Step 6: Final answer
    x = 100,438.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.