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Finding the Fourth Proportional to 721.20, 1,082.16 and 288.48

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Solution

The fourth proportional to 721.20, 1,082.16 and 288.48 is: 432.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.20 : 1,082.16 = 288.48 : x
  2. Step 2: Convert to fraction form
    721.20/1,082.16 = 288.48/x
  3. Step 3: Cross multiply
    721.20x = 1,082.16 × 288.48
  4. Step 4: Simplify right side
    721.20x = 312,181.52
  5. Step 5: Solve for x
    x = 312,181.52/721.20
  6. Step 6: Final answer
    x = 432.86

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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.