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Finding the Fourth Proportional to 118.76, 163.85 and 66.30

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Solution

The fourth proportional to 118.76, 163.85 and 66.30 is: 91.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.76 : 163.85 = 66.30 : x
  2. Step 2: Convert to fraction form
    118.76/163.85 = 66.30/x
  3. Step 3: Cross multiply
    118.76x = 163.85 × 66.30
  4. Step 4: Simplify right side
    118.76x = 10,863.23
  5. Step 5: Solve for x
    x = 10,863.23/118.76
  6. Step 6: Final answer
    x = 91.47

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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.