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Finding the Fourth Proportional to 891.16, 1,229.87 and 498.25

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Solution

The fourth proportional to 891.16, 1,229.87 and 498.25 is: 687.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.16 : 1,229.87 = 498.25 : x
  2. Step 2: Convert to fraction form
    891.16/1,229.87 = 498.25/x
  3. Step 3: Cross multiply
    891.16x = 1,229.87 × 498.25
  4. Step 4: Simplify right side
    891.16x = 612,782.73
  5. Step 5: Solve for x
    x = 612,782.73/891.16
  6. Step 6: Final answer
    x = 687.62

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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.