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Finding the Fourth Proportional to 721.72, 1,082.57 and 234.79

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Solution

The fourth proportional to 721.72, 1,082.57 and 234.79 is: 352.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.72 : 1,082.57 = 234.79 : x
  2. Step 2: Convert to fraction form
    721.72/1,082.57 = 234.79/x
  3. Step 3: Cross multiply
    721.72x = 1,082.57 × 234.79
  4. Step 4: Simplify right side
    721.72x = 254,170.02
  5. Step 5: Solve for x
    x = 254,170.02/721.72
  6. Step 6: Final answer
    x = 352.18

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Double scale
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1.5x scale

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.