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Finding the Fourth Proportional to 91.92, 136.92 and 90.48

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Solution

The fourth proportional to 91.92, 136.92 and 90.48 is: 134.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.92 : 136.92 = 90.48 : x
  2. Step 2: Convert to fraction form
    91.92/136.92 = 90.48/x
  3. Step 3: Cross multiply
    91.92x = 136.92 × 90.48
  4. Step 4: Simplify right side
    91.92x = 12,388.52
  5. Step 5: Solve for x
    x = 12,388.52/91.92
  6. Step 6: Final answer
    x = 134.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.