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Finding the Fourth Proportional to 721.34, 1,082.11 and 258.97

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Solution

The fourth proportional to 721.34, 1,082.11 and 258.97 is: 388.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.34 : 1,082.11 = 258.97 : x
  2. Step 2: Convert to fraction form
    721.34/1,082.11 = 258.97/x
  3. Step 3: Cross multiply
    721.34x = 1,082.11 × 258.97
  4. Step 4: Simplify right side
    721.34x = 280,234.03
  5. Step 5: Solve for x
    x = 280,234.03/721.34
  6. Step 6: Final answer
    x = 388.49

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.