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Finding the Fourth Proportional to 891.22, 1,229.91 and 498.31

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Solution

The fourth proportional to 891.22, 1,229.91 and 498.31 is: 687.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.22 : 1,229.91 = 498.31 : x
  2. Step 2: Convert to fraction form
    891.22/1,229.91 = 498.31/x
  3. Step 3: Cross multiply
    891.22x = 1,229.91 × 498.31
  4. Step 4: Simplify right side
    891.22x = 612,876.45
  5. Step 5: Solve for x
    x = 612,876.45/891.22
  6. Step 6: Final answer
    x = 687.68

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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.