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Finding the Fourth Proportional to 387.10, 580.67 and 127.18

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Solution

The fourth proportional to 387.10, 580.67 and 127.18 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 580.67 = 127.18 : x
  2. Step 2: Convert to fraction form
    387.10/580.67 = 127.18/x
  3. Step 3: Cross multiply
    387.10x = 580.67 × 127.18
  4. Step 4: Simplify right side
    387.10x = 73,849.61
  5. Step 5: Solve for x
    x = 73,849.61/387.10
  6. Step 6: Final answer
    x = 190.78

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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.