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Finding the Fourth Proportional to 809.25, 1,213.66 and 679.29

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Solution

The fourth proportional to 809.25, 1,213.66 and 679.29 is: 1,018.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.25 : 1,213.66 = 679.29 : x
  2. Step 2: Convert to fraction form
    809.25/1,213.66 = 679.29/x
  3. Step 3: Cross multiply
    809.25x = 1,213.66 × 679.29
  4. Step 4: Simplify right side
    809.25x = 824,427.10
  5. Step 5: Solve for x
    x = 824,427.10/809.25
  6. Step 6: Final answer
    x = 1,018.75

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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.