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Finding the Fourth Proportional to 381,715.29, 572,639.00 and 128,997.81

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Solution

The fourth proportional to 381,715.29, 572,639.00 and 128,997.81 is: 193,519.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,715.29 : 572,639.00 = 128,997.81 : x
  2. Step 2: Convert to fraction form
    381,715.29/572,639.00 = 128,997.81/x
  3. Step 3: Cross multiply
    381,715.29x = 572,639.00 × 128,997.81
  4. Step 4: Simplify right side
    381,715.29x = 73,869,176,275.60
  5. Step 5: Solve for x
    x = 73,869,176,275.60/381,715.29
  6. Step 6: Final answer
    x = 193,519.04

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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.