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Finding the Fourth Proportional to 859.85, 1,290.87 and 449.27

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Solution

The fourth proportional to 859.85, 1,290.87 and 449.27 is: 674.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.85 : 1,290.87 = 449.27 : x
  2. Step 2: Convert to fraction form
    859.85/1,290.87 = 449.27/x
  3. Step 3: Cross multiply
    859.85x = 1,290.87 × 449.27
  4. Step 4: Simplify right side
    859.85x = 579,949.16
  5. Step 5: Solve for x
    x = 579,949.16/859.85
  6. Step 6: Final answer
    x = 674.48

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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.