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Finding the Fourth Proportional to 721.29, 1,082.10 and 208.25

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Solution

The fourth proportional to 721.29, 1,082.10 and 208.25 is: 312.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.29 : 1,082.10 = 208.25 : x
  2. Step 2: Convert to fraction form
    721.29/1,082.10 = 208.25/x
  3. Step 3: Cross multiply
    721.29x = 1,082.10 × 208.25
  4. Step 4: Simplify right side
    721.29x = 225,346.28
  5. Step 5: Solve for x
    x = 225,346.28/721.29
  6. Step 6: Final answer
    x = 312.42

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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.