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Finding the Fourth Proportional to 90.96, 136.34 and 63.90

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Solution

The fourth proportional to 90.96, 136.34 and 63.90 is: 95.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.96 : 136.34 = 63.90 : x
  2. Step 2: Convert to fraction form
    90.96/136.34 = 63.90/x
  3. Step 3: Cross multiply
    90.96x = 136.34 × 63.90
  4. Step 4: Simplify right side
    90.96x = 8,712.13
  5. Step 5: Solve for x
    x = 8,712.13/90.96
  6. Step 6: Final answer
    x = 95.78

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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.