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Finding the Fourth Proportional to 96.80, 133.63 and 65.72

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Solution

The fourth proportional to 96.80, 133.63 and 65.72 is: 90.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.80 : 133.63 = 65.72 : x
  2. Step 2: Convert to fraction form
    96.80/133.63 = 65.72/x
  3. Step 3: Cross multiply
    96.80x = 133.63 × 65.72
  4. Step 4: Simplify right side
    96.80x = 8,781.33
  5. Step 5: Solve for x
    x = 8,781.33/96.80
  6. Step 6: Final answer
    x = 90.72

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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.