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Finding the Fourth Proportional to 381,626.08, 572,505.09 and 128,908.40

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Solution

The fourth proportional to 381,626.08, 572,505.09 and 128,908.40 is: 193,384.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,626.08 : 572,505.09 = 128,908.40 : x
  2. Step 2: Convert to fraction form
    381,626.08/572,505.09 = 128,908.40/x
  3. Step 3: Cross multiply
    381,626.08x = 572,505.09 × 128,908.40
  4. Step 4: Simplify right side
    381,626.08x = 73,800,716,575.02
  5. Step 5: Solve for x
    x = 73,800,716,575.02/381,626.08
  6. Step 6: Final answer
    x = 193,384.89

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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.