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Finding the Fourth Proportional to 721.58, 1,082.21 and 234.50

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Solution

The fourth proportional to 721.58, 1,082.21 and 234.50 is: 351.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.58 : 1,082.21 = 234.50 : x
  2. Step 2: Convert to fraction form
    721.58/1,082.21 = 234.50/x
  3. Step 3: Cross multiply
    721.58x = 1,082.21 × 234.50
  4. Step 4: Simplify right side
    721.58x = 253,771.66
  5. Step 5: Solve for x
    x = 253,771.66/721.58
  6. Step 6: Final answer
    x = 351.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.