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Finding the Fourth Proportional to 809.08, 1,211.31 and 614.87

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Solution

The fourth proportional to 809.08, 1,211.31 and 614.87 is: 920.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.08 : 1,211.31 = 614.87 : x
  2. Step 2: Convert to fraction form
    809.08/1,211.31 = 614.87/x
  3. Step 3: Cross multiply
    809.08x = 1,211.31 × 614.87
  4. Step 4: Simplify right side
    809.08x = 744,791.75
  5. Step 5: Solve for x
    x = 744,791.75/809.08
  6. Step 6: Final answer
    x = 920.55

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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.