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Finding the Fourth Proportional to 233.12, 321.72 and 129.62

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Solution

The fourth proportional to 233.12, 321.72 and 129.62 is: 178.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.12 : 321.72 = 129.62 : x
  2. Step 2: Convert to fraction form
    233.12/321.72 = 129.62/x
  3. Step 3: Cross multiply
    233.12x = 321.72 × 129.62
  4. Step 4: Simplify right side
    233.12x = 41,701.35
  5. Step 5: Solve for x
    x = 41,701.35/233.12
  6. Step 6: Final answer
    x = 178.88

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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.