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Finding the Fourth Proportional to 251.92, 378 and 143.76

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Solution

The fourth proportional to 251.92, 378 and 143.76 is: 215.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.92 : 378 = 143.76 : x
  2. Step 2: Convert to fraction form
    251.92/378 = 143.76/x
  3. Step 3: Cross multiply
    251.92x = 378 × 143.76
  4. Step 4: Simplify right side
    251.92x = 54,341.28
  5. Step 5: Solve for x
    x = 54,341.28/251.92
  6. Step 6: Final answer
    x = 215.71

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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.