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Finding the Fourth Proportional to 118.17, 162.68 and 99.72

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Solution

The fourth proportional to 118.17, 162.68 and 99.72 is: 137.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.17 : 162.68 = 99.72 : x
  2. Step 2: Convert to fraction form
    118.17/162.68 = 99.72/x
  3. Step 3: Cross multiply
    118.17x = 162.68 × 99.72
  4. Step 4: Simplify right side
    118.17x = 16,221.95
  5. Step 5: Solve for x
    x = 16,221.95/118.17
  6. Step 6: Final answer
    x = 137.28

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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.