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Finding the Fourth Proportional to 721.45, 1,082.18 and 259.56

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Solution

The fourth proportional to 721.45, 1,082.18 and 259.56 is: 389.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.45 : 1,082.18 = 259.56 : x
  2. Step 2: Convert to fraction form
    721.45/1,082.18 = 259.56/x
  3. Step 3: Cross multiply
    721.45x = 1,082.18 × 259.56
  4. Step 4: Simplify right side
    721.45x = 280,889.26
  5. Step 5: Solve for x
    x = 280,889.26/721.45
  6. Step 6: Final answer
    x = 389.34

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1.5x scale

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.