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Finding the Fourth Proportional to 106.18, 146.45 and 66.85

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Solution

The fourth proportional to 106.18, 146.45 and 66.85 is: 92.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.18 : 146.45 = 66.85 : x
  2. Step 2: Convert to fraction form
    106.18/146.45 = 66.85/x
  3. Step 3: Cross multiply
    106.18x = 146.45 × 66.85
  4. Step 4: Simplify right side
    106.18x = 9,789.98
  5. Step 5: Solve for x
    x = 9,789.98/106.18
  6. Step 6: Final answer
    x = 92.20

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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.