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Finding the Fourth Proportional to 118.16, 177.03 and 81.54

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Solution

The fourth proportional to 118.16, 177.03 and 81.54 is: 122.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.16 : 177.03 = 81.54 : x
  2. Step 2: Convert to fraction form
    118.16/177.03 = 81.54/x
  3. Step 3: Cross multiply
    118.16x = 177.03 × 81.54
  4. Step 4: Simplify right side
    118.16x = 14,434.60
  5. Step 5: Solve for x
    x = 14,434.60/118.16
  6. Step 6: Final answer
    x = 122.16

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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.