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Finding the Fourth Proportional to 809.79, 1,117.88 and 610.70

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Solution

The fourth proportional to 809.79, 1,117.88 and 610.70 is: 843.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.79 : 1,117.88 = 610.70 : x
  2. Step 2: Convert to fraction form
    809.79/1,117.88 = 610.70/x
  3. Step 3: Cross multiply
    809.79x = 1,117.88 × 610.70
  4. Step 4: Simplify right side
    809.79x = 682,689.32
  5. Step 5: Solve for x
    x = 682,689.32/809.79
  6. Step 6: Final answer
    x = 843.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.