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Finding the Fourth Proportional to 721.18, 1,082.11 and 355.77

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Solution

The fourth proportional to 721.18, 1,082.11 and 355.77 is: 533.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.18 : 1,082.11 = 355.77 : x
  2. Step 2: Convert to fraction form
    721.18/1,082.11 = 355.77/x
  3. Step 3: Cross multiply
    721.18x = 1,082.11 × 355.77
  4. Step 4: Simplify right side
    721.18x = 384,981.39
  5. Step 5: Solve for x
    x = 384,981.39/721.18
  6. Step 6: Final answer
    x = 533.82

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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.