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Finding the Fourth Proportional to 891.24, 1,229.91 and 498.30

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Solution

The fourth proportional to 891.24, 1,229.91 and 498.30 is: 687.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.24 : 1,229.91 = 498.30 : x
  2. Step 2: Convert to fraction form
    891.24/1,229.91 = 498.30/x
  3. Step 3: Cross multiply
    891.24x = 1,229.91 × 498.30
  4. Step 4: Simplify right side
    891.24x = 612,864.15
  5. Step 5: Solve for x
    x = 612,864.15/891.24
  6. Step 6: Final answer
    x = 687.65

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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.