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Finding the Fourth Proportional to 118.17, 163.10 and 76.72

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Solution

The fourth proportional to 118.17, 163.10 and 76.72 is: 105.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.17 : 163.10 = 76.72 : x
  2. Step 2: Convert to fraction form
    118.17/163.10 = 76.72/x
  3. Step 3: Cross multiply
    118.17x = 163.10 × 76.72
  4. Step 4: Simplify right side
    118.17x = 12,513.03
  5. Step 5: Solve for x
    x = 12,513.03/118.17
  6. Step 6: Final answer
    x = 105.89

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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.