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Finding the Fourth Proportional to 252.48, 378.72 and 81.52

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Solution

The fourth proportional to 252.48, 378.72 and 81.52 is: 122.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.48 : 378.72 = 81.52 : x
  2. Step 2: Convert to fraction form
    252.48/378.72 = 81.52/x
  3. Step 3: Cross multiply
    252.48x = 378.72 × 81.52
  4. Step 4: Simplify right side
    252.48x = 30,873.25
  5. Step 5: Solve for x
    x = 30,873.25/252.48
  6. Step 6: Final answer
    x = 122.28

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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.