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Finding the Fourth Proportional to 387.43, 580.92 and 156.13

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Solution

The fourth proportional to 387.43, 580.92 and 156.13 is: 234.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.43 : 580.92 = 156.13 : x
  2. Step 2: Convert to fraction form
    387.43/580.92 = 156.13/x
  3. Step 3: Cross multiply
    387.43x = 580.92 × 156.13
  4. Step 4: Simplify right side
    387.43x = 90,699.04
  5. Step 5: Solve for x
    x = 90,699.04/387.43
  6. Step 6: Final answer
    x = 234.10

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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.