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Finding the Fourth Proportional to 248.63, 372.92 and 86.31

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Solution

The fourth proportional to 248.63, 372.92 and 86.31 is: 129.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.63 : 372.92 = 86.31 : x
  2. Step 2: Convert to fraction form
    248.63/372.92 = 86.31/x
  3. Step 3: Cross multiply
    248.63x = 372.92 × 86.31
  4. Step 4: Simplify right side
    248.63x = 32,186.29
  5. Step 5: Solve for x
    x = 32,186.29/248.63
  6. Step 6: Final answer
    x = 129.46

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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.