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Finding the Fourth Proportional to 96.80, 133.20 and 90.64

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Solution

The fourth proportional to 96.80, 133.20 and 90.64 is: 124.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.80 : 133.20 = 90.64 : x
  2. Step 2: Convert to fraction form
    96.80/133.20 = 90.64/x
  3. Step 3: Cross multiply
    96.80x = 133.20 × 90.64
  4. Step 4: Simplify right side
    96.80x = 12,073.25
  5. Step 5: Solve for x
    x = 12,073.25/96.80
  6. Step 6: Final answer
    x = 124.72

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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.