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Finding the Fourth Proportional to 721.71, 1,082.55 and 288.75

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Solution

The fourth proportional to 721.71, 1,082.55 and 288.75 is: 433.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.71 : 1,082.55 = 288.75 : x
  2. Step 2: Convert to fraction form
    721.71/1,082.55 = 288.75/x
  3. Step 3: Cross multiply
    721.71x = 1,082.55 × 288.75
  4. Step 4: Simplify right side
    721.71x = 312,586.31
  5. Step 5: Solve for x
    x = 312,586.31/721.71
  6. Step 6: Final answer
    x = 433.12

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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.