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Finding the Fourth Proportional to 813.57, 1,217.01 and 676.80

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Solution

The fourth proportional to 813.57, 1,217.01 and 676.80 is: 1,012.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.57 : 1,217.01 = 676.80 : x
  2. Step 2: Convert to fraction form
    813.57/1,217.01 = 676.80/x
  3. Step 3: Cross multiply
    813.57x = 1,217.01 × 676.80
  4. Step 4: Simplify right side
    813.57x = 823,672.37
  5. Step 5: Solve for x
    x = 823,672.37/813.57
  6. Step 6: Final answer
    x = 1,012.42

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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.