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Finding the Fourth Proportional to 809.18, 1,215.96 and 679.76

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Solution

The fourth proportional to 809.18, 1,215.96 and 679.76 is: 1,021.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.18 : 1,215.96 = 679.76 : x
  2. Step 2: Convert to fraction form
    809.18/1,215.96 = 679.76/x
  3. Step 3: Cross multiply
    809.18x = 1,215.96 × 679.76
  4. Step 4: Simplify right side
    809.18x = 826,560.97
  5. Step 5: Solve for x
    x = 826,560.97/809.18
  6. Step 6: Final answer
    x = 1,021.48

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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.