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Finding the Fourth Proportional to 860.44, 1,290.81 and 449.92

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Solution

The fourth proportional to 860.44, 1,290.81 and 449.92 is: 674.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.44 : 1,290.81 = 449.92 : x
  2. Step 2: Convert to fraction form
    860.44/1,290.81 = 449.92/x
  3. Step 3: Cross multiply
    860.44x = 1,290.81 × 449.92
  4. Step 4: Simplify right side
    860.44x = 580,761.24
  5. Step 5: Solve for x
    x = 580,761.24/860.44
  6. Step 6: Final answer
    x = 674.96

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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.