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Finding the Fourth Proportional to 381,633.39, 572,516.07 and 128,915.73

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Solution

The fourth proportional to 381,633.39, 572,516.07 and 128,915.73 is: 193,395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,633.39 : 572,516.07 = 128,915.73 : x
  2. Step 2: Convert to fraction form
    381,633.39/572,516.07 = 128,915.73/x
  3. Step 3: Cross multiply
    381,633.39x = 572,516.07 × 128,915.73
  4. Step 4: Simplify right side
    381,633.39x = 73,806,327,100.78
  5. Step 5: Solve for x
    x = 73,806,327,100.78/381,633.39
  6. Step 6: Final answer
    x = 193,395.88

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1.5x scale

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.