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Finding the Fourth Proportional to 872.49, 1,309.17 and 324.79

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Solution

The fourth proportional to 872.49, 1,309.17 and 324.79 is: 487.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.49 : 1,309.17 = 324.79 : x
  2. Step 2: Convert to fraction form
    872.49/1,309.17 = 324.79/x
  3. Step 3: Cross multiply
    872.49x = 1,309.17 × 324.79
  4. Step 4: Simplify right side
    872.49x = 425,205.32
  5. Step 5: Solve for x
    x = 425,205.32/872.49
  6. Step 6: Final answer
    x = 487.35

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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.