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Finding the Fourth Proportional to 2,281.87, 3,422.85 and 721.90

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Solution

The fourth proportional to 2,281.87, 3,422.85 and 721.90 is: 1,082.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,281.87 : 3,422.85 = 721.90 : x
  2. Step 2: Convert to fraction form
    2,281.87/3,422.85 = 721.90/x
  3. Step 3: Cross multiply
    2,281.87x = 3,422.85 × 721.90
  4. Step 4: Simplify right side
    2,281.87x = 2,470,955.42
  5. Step 5: Solve for x
    x = 2,470,955.42/2,281.87
  6. Step 6: Final answer
    x = 1,082.86

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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.