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Finding the Fourth Proportional to 96.82, 145.17 and 85.43

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Solution

The fourth proportional to 96.82, 145.17 and 85.43 is: 128.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.82 : 145.17 = 85.43 : x
  2. Step 2: Convert to fraction form
    96.82/145.17 = 85.43/x
  3. Step 3: Cross multiply
    96.82x = 145.17 × 85.43
  4. Step 4: Simplify right side
    96.82x = 12,402.13
  5. Step 5: Solve for x
    x = 12,402.13/96.82
  6. Step 6: Final answer
    x = 128.09

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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.