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Finding the Fourth Proportional to 805.18, 1,109.92 and 630.22

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Solution

The fourth proportional to 805.18, 1,109.92 and 630.22 is: 868.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.18 : 1,109.92 = 630.22 : x
  2. Step 2: Convert to fraction form
    805.18/1,109.92 = 630.22/x
  3. Step 3: Cross multiply
    805.18x = 1,109.92 × 630.22
  4. Step 4: Simplify right side
    805.18x = 699,493.78
  5. Step 5: Solve for x
    x = 699,493.78/805.18
  6. Step 6: Final answer
    x = 868.74

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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.