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Finding the Fourth Proportional to 90.92, 124.94 and 74.52

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Solution

The fourth proportional to 90.92, 124.94 and 74.52 is: 102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.92 : 124.94 = 74.52 : x
  2. Step 2: Convert to fraction form
    90.92/124.94 = 74.52/x
  3. Step 3: Cross multiply
    90.92x = 124.94 × 74.52
  4. Step 4: Simplify right side
    90.92x = 9,310.53
  5. Step 5: Solve for x
    x = 9,310.53/90.92
  6. Step 6: Final answer
    x = 102.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.