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Finding the Fourth Proportional to 721.15, 1,082.73 and 356.05

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Solution

The fourth proportional to 721.15, 1,082.73 and 356.05 is: 534.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.15 : 1,082.73 = 356.05 : x
  2. Step 2: Convert to fraction form
    721.15/1,082.73 = 356.05/x
  3. Step 3: Cross multiply
    721.15x = 1,082.73 × 356.05
  4. Step 4: Simplify right side
    721.15x = 385,506.02
  5. Step 5: Solve for x
    x = 385,506.02/721.15
  6. Step 6: Final answer
    x = 534.57

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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.