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Finding the Fourth Proportional to 381,387.15, 572,173.29 and 115,131.78

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Solution

The fourth proportional to 381,387.15, 572,173.29 and 115,131.78 is: 172,725.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,387.15 : 572,173.29 = 115,131.78 : x
  2. Step 2: Convert to fraction form
    381,387.15/572,173.29 = 115,131.78/x
  3. Step 3: Cross multiply
    381,387.15x = 572,173.29 × 115,131.78
  4. Step 4: Simplify right side
    381,387.15x = 65,875,329,346.16
  5. Step 5: Solve for x
    x = 65,875,329,346.16/381,387.15
  6. Step 6: Final answer
    x = 172,725.61

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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.