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Finding the Fourth Proportional to 129,527.92, 178,773.66 and 72,939.64

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Solution

The fourth proportional to 129,527.92, 178,773.66 and 72,939.64 is: 100,670.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,527.92 : 178,773.66 = 72,939.64 : x
  2. Step 2: Convert to fraction form
    129,527.92/178,773.66 = 72,939.64/x
  3. Step 3: Cross multiply
    129,527.92x = 178,773.66 × 72,939.64
  4. Step 4: Simplify right side
    129,527.92x = 13,039,686,401.88
  5. Step 5: Solve for x
    x = 13,039,686,401.88/129,527.92
  6. Step 6: Final answer
    x = 100,670.85

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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.