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Finding the Fourth Proportional to 96.78, 145.17 and 79.88

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Solution

The fourth proportional to 96.78, 145.17 and 79.88 is: 119.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.78 : 145.17 = 79.88 : x
  2. Step 2: Convert to fraction form
    96.78/145.17 = 79.88/x
  3. Step 3: Cross multiply
    96.78x = 145.17 × 79.88
  4. Step 4: Simplify right side
    96.78x = 11,595.45
  5. Step 5: Solve for x
    x = 11,595.45/96.78
  6. Step 6: Final answer
    x = 119.81

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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.