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Finding the Fourth Proportional to 721.58, 1,082.21 and 201.47

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Solution

The fourth proportional to 721.58, 1,082.21 and 201.47 is: 302.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.58 : 1,082.21 = 201.47 : x
  2. Step 2: Convert to fraction form
    721.58/1,082.21 = 201.47/x
  3. Step 3: Cross multiply
    721.58x = 1,082.21 × 201.47
  4. Step 4: Simplify right side
    721.58x = 218,026.43
  5. Step 5: Solve for x
    x = 218,026.43/721.58
  6. Step 6: Final answer
    x = 302.15

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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.