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Finding the Fourth Proportional to 249.48, 374.24 and 84.90

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Solution

The fourth proportional to 249.48, 374.24 and 84.90 is: 127.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.48 : 374.24 = 84.90 : x
  2. Step 2: Convert to fraction form
    249.48/374.24 = 84.90/x
  3. Step 3: Cross multiply
    249.48x = 374.24 × 84.90
  4. Step 4: Simplify right side
    249.48x = 31,772.89
  5. Step 5: Solve for x
    x = 31,772.89/249.48
  6. Step 6: Final answer
    x = 127.36

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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.