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Finding the Fourth Proportional to 118.16, 176.38 and 87.58

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Solution

The fourth proportional to 118.16, 176.38 and 87.58 is: 130.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.16 : 176.38 = 87.58 : x
  2. Step 2: Convert to fraction form
    118.16/176.38 = 87.58/x
  3. Step 3: Cross multiply
    118.16x = 176.38 × 87.58
  4. Step 4: Simplify right side
    118.16x = 15,447.36
  5. Step 5: Solve for x
    x = 15,447.36/118.16
  6. Step 6: Final answer
    x = 130.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.