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Finding the Fourth Proportional to 721.81, 1,082.60 and 201.85

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Solution

The fourth proportional to 721.81, 1,082.60 and 201.85 is: 302.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.81 : 1,082.60 = 201.85 : x
  2. Step 2: Convert to fraction form
    721.81/1,082.60 = 201.85/x
  3. Step 3: Cross multiply
    721.81x = 1,082.60 × 201.85
  4. Step 4: Simplify right side
    721.81x = 218,519.85
  5. Step 5: Solve for x
    x = 218,519.85/721.81
  6. Step 6: Final answer
    x = 302.74

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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.