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Finding the Fourth Proportional to 809.39, 1,116.99 and 514.65

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Solution

The fourth proportional to 809.39, 1,116.99 and 514.65 is: 710.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.39 : 1,116.99 = 514.65 : x
  2. Step 2: Convert to fraction form
    809.39/1,116.99 = 514.65/x
  3. Step 3: Cross multiply
    809.39x = 1,116.99 × 514.65
  4. Step 4: Simplify right side
    809.39x = 574,863.09
  5. Step 5: Solve for x
    x = 574,863.09/809.39
  6. Step 6: Final answer
    x = 710.24

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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.