Home / 1,315.12-1,972.68-449.43

Finding the Fourth Proportional to 1,315.12, 1,972.68 and 449.43

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Solution

The fourth proportional to 1,315.12, 1,972.68 and 449.43 is: 674.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.12 : 1,972.68 = 449.43 : x
  2. Step 2: Convert to fraction form
    1,315.12/1,972.68 = 449.43/x
  3. Step 3: Cross multiply
    1,315.12x = 1,972.68 × 449.43
  4. Step 4: Simplify right side
    1,315.12x = 886,581.57
  5. Step 5: Solve for x
    x = 886,581.57/1,315.12
  6. Step 6: Final answer
    x = 674.15

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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.