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Finding the Fourth Proportional to 146.68, 202.42 and 81.19

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Solution

The fourth proportional to 146.68, 202.42 and 81.19 is: 112.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.68 : 202.42 = 81.19 : x
  2. Step 2: Convert to fraction form
    146.68/202.42 = 81.19/x
  3. Step 3: Cross multiply
    146.68x = 202.42 × 81.19
  4. Step 4: Simplify right side
    146.68x = 16,433.47
  5. Step 5: Solve for x
    x = 16,433.47/146.68
  6. Step 6: Final answer
    x = 112.04

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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.