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Finding the Fourth Proportional to 721.36, 1,082.10 and 208.36

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Solution

The fourth proportional to 721.36, 1,082.10 and 208.36 is: 312.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.36 : 1,082.10 = 208.36 : x
  2. Step 2: Convert to fraction form
    721.36/1,082.10 = 208.36/x
  3. Step 3: Cross multiply
    721.36x = 1,082.10 × 208.36
  4. Step 4: Simplify right side
    721.36x = 225,466.36
  5. Step 5: Solve for x
    x = 225,466.36/721.36
  6. Step 6: Final answer
    x = 312.56

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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.