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Finding the Fourth Proportional to 129,620.66, 178,882.02 and 72,259.97

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Solution

The fourth proportional to 129,620.66, 178,882.02 and 72,259.97 is: 99,721.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,620.66 : 178,882.02 = 72,259.97 : x
  2. Step 2: Convert to fraction form
    129,620.66/178,882.02 = 72,259.97/x
  3. Step 3: Cross multiply
    129,620.66x = 178,882.02 × 72,259.97
  4. Step 4: Simplify right side
    129,620.66x = 12,926,008,504.33
  5. Step 5: Solve for x
    x = 12,926,008,504.33/129,620.66
  6. Step 6: Final answer
    x = 99,721.83

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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.