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Finding the Fourth Proportional to 96.78, 145.17 and 42.66

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Solution

The fourth proportional to 96.78, 145.17 and 42.66 is: 63.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.78 : 145.17 = 42.66 : x
  2. Step 2: Convert to fraction form
    96.78/145.17 = 42.66/x
  3. Step 3: Cross multiply
    96.78x = 145.17 × 42.66
  4. Step 4: Simplify right side
    96.78x = 6,192.95
  5. Step 5: Solve for x
    x = 6,192.95/96.78
  6. Step 6: Final answer
    x = 63.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.