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Finding the Fourth Proportional to 248.54, 372.84 and 86.18

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Solution

The fourth proportional to 248.54, 372.84 and 86.18 is: 129.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.54 : 372.84 = 86.18 : x
  2. Step 2: Convert to fraction form
    248.54/372.84 = 86.18/x
  3. Step 3: Cross multiply
    248.54x = 372.84 × 86.18
  4. Step 4: Simplify right side
    248.54x = 32,132.28
  5. Step 5: Solve for x
    x = 32,132.28/248.54
  6. Step 6: Final answer
    x = 129.29

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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.