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Finding the Fourth Proportional to 90.68, 124.92 and 63

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Solution

The fourth proportional to 90.68, 124.92 and 63 is: 86.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.68 : 124.92 = 63 : x
  2. Step 2: Convert to fraction form
    90.68/124.92 = 63/x
  3. Step 3: Cross multiply
    90.68x = 124.92 × 63
  4. Step 4: Simplify right side
    90.68x = 7,869.96
  5. Step 5: Solve for x
    x = 7,869.96/90.68
  6. Step 6: Final answer
    x = 86.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.