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Finding the Fourth Proportional to 96.64, 133.08 and 87.92

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Solution

The fourth proportional to 96.64, 133.08 and 87.92 is: 121.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.64 : 133.08 = 87.92 : x
  2. Step 2: Convert to fraction form
    96.64/133.08 = 87.92/x
  3. Step 3: Cross multiply
    96.64x = 133.08 × 87.92
  4. Step 4: Simplify right side
    96.64x = 11,700.39
  5. Step 5: Solve for x
    x = 11,700.39/96.64
  6. Step 6: Final answer
    x = 121.07

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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.