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Finding the Fourth Proportional to 146.62, 202.12 and 129.21

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Solution

The fourth proportional to 146.62, 202.12 and 129.21 is: 178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.62 : 202.12 = 129.21 : x
  2. Step 2: Convert to fraction form
    146.62/202.12 = 129.21/x
  3. Step 3: Cross multiply
    146.62x = 202.12 × 129.21
  4. Step 4: Simplify right side
    146.62x = 26,115.93
  5. Step 5: Solve for x
    x = 26,115.93/146.62
  6. Step 6: Final answer
    x = 178.12

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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.