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Finding the Fourth Proportional to 96.75, 133.61 and 72.18

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Solution

The fourth proportional to 96.75, 133.61 and 72.18 is: 99.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.75 : 133.61 = 72.18 : x
  2. Step 2: Convert to fraction form
    96.75/133.61 = 72.18/x
  3. Step 3: Cross multiply
    96.75x = 133.61 × 72.18
  4. Step 4: Simplify right side
    96.75x = 9,643.61
  5. Step 5: Solve for x
    x = 9,643.61/96.75
  6. Step 6: Final answer
    x = 99.68

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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.