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Finding the Fourth Proportional to 118.06, 163 and 76.72

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Solution

The fourth proportional to 118.06, 163 and 76.72 is: 105.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.06 : 163 = 76.72 : x
  2. Step 2: Convert to fraction form
    118.06/163 = 76.72/x
  3. Step 3: Cross multiply
    118.06x = 163 × 76.72
  4. Step 4: Simplify right side
    118.06x = 12,505.36
  5. Step 5: Solve for x
    x = 12,505.36/118.06
  6. Step 6: Final answer
    x = 105.92

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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.