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Finding the Fourth Proportional to 387.60, 581.85 and 251.61

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Solution

The fourth proportional to 387.60, 581.85 and 251.61 is: 377.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.60 : 581.85 = 251.61 : x
  2. Step 2: Convert to fraction form
    387.60/581.85 = 251.61/x
  3. Step 3: Cross multiply
    387.60x = 581.85 × 251.61
  4. Step 4: Simplify right side
    387.60x = 146,399.28
  5. Step 5: Solve for x
    x = 146,399.28/387.60
  6. Step 6: Final answer
    x = 377.71

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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.