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Finding the Fourth Proportional to 96.65, 144.03 and 91.79

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Solution

The fourth proportional to 96.65, 144.03 and 91.79 is: 136.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.65 : 144.03 = 91.79 : x
  2. Step 2: Convert to fraction form
    96.65/144.03 = 91.79/x
  3. Step 3: Cross multiply
    96.65x = 144.03 × 91.79
  4. Step 4: Simplify right side
    96.65x = 13,220.14
  5. Step 5: Solve for x
    x = 13,220.14/96.65
  6. Step 6: Final answer
    x = 136.79

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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.