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Finding the Fourth Proportional to 232.90, 321.36 and 129.40

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Solution

The fourth proportional to 232.90, 321.36 and 129.40 is: 178.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    232.90 : 321.36 = 129.40 : x
  2. Step 2: Convert to fraction form
    232.90/321.36 = 129.40/x
  3. Step 3: Cross multiply
    232.90x = 321.36 × 129.40
  4. Step 4: Simplify right side
    232.90x = 41,583.98
  5. Step 5: Solve for x
    x = 41,583.98/232.90
  6. Step 6: Final answer
    x = 178.55

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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.