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Finding the Fourth Proportional to 724.29, 1,078.96 and 679.47

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Solution

The fourth proportional to 724.29, 1,078.96 and 679.47 is: 1,012.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.29 : 1,078.96 = 679.47 : x
  2. Step 2: Convert to fraction form
    724.29/1,078.96 = 679.47/x
  3. Step 3: Cross multiply
    724.29x = 1,078.96 × 679.47
  4. Step 4: Simplify right side
    724.29x = 733,119.25
  5. Step 5: Solve for x
    x = 733,119.25/724.29
  6. Step 6: Final answer
    x = 1,012.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.