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Finding the Fourth Proportional to 721.44, 1,082.16 and 355.86

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Solution

The fourth proportional to 721.44, 1,082.16 and 355.86 is: 533.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.44 : 1,082.16 = 355.86 : x
  2. Step 2: Convert to fraction form
    721.44/1,082.16 = 355.86/x
  3. Step 3: Cross multiply
    721.44x = 1,082.16 × 355.86
  4. Step 4: Simplify right side
    721.44x = 385,097.46
  5. Step 5: Solve for x
    x = 385,097.46/721.44
  6. Step 6: Final answer
    x = 533.79

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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.