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Finding the Fourth Proportional to 118.38, 163.45 and 87.34

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Solution

The fourth proportional to 118.38, 163.45 and 87.34 is: 120.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.38 : 163.45 = 87.34 : x
  2. Step 2: Convert to fraction form
    118.38/163.45 = 87.34/x
  3. Step 3: Cross multiply
    118.38x = 163.45 × 87.34
  4. Step 4: Simplify right side
    118.38x = 14,275.72
  5. Step 5: Solve for x
    x = 14,275.72/118.38
  6. Step 6: Final answer
    x = 120.59

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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.