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Finding the Fourth Proportional to 129,586.79, 178,830.61 and 72,229.76

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Solution

The fourth proportional to 129,586.79, 178,830.61 and 72,229.76 is: 99,677.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,586.79 : 178,830.61 = 72,229.76 : x
  2. Step 2: Convert to fraction form
    129,586.79/178,830.61 = 72,229.76/x
  3. Step 3: Cross multiply
    129,586.79x = 178,830.61 × 72,229.76
  4. Step 4: Simplify right side
    129,586.79x = 12,916,890,785.65
  5. Step 5: Solve for x
    x = 12,916,890,785.65/129,586.79
  6. Step 6: Final answer
    x = 99,677.53

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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.