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Finding the Fourth Proportional to 721.81, 1,082.81 and 374.19

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Solution

The fourth proportional to 721.81, 1,082.81 and 374.19 is: 561.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.81 : 1,082.81 = 374.19 : x
  2. Step 2: Convert to fraction form
    721.81/1,082.81 = 374.19/x
  3. Step 3: Cross multiply
    721.81x = 1,082.81 × 374.19
  4. Step 4: Simplify right side
    721.81x = 405,176.67
  5. Step 5: Solve for x
    x = 405,176.67/721.81
  6. Step 6: Final answer
    x = 561.33

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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.