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Finding the Fourth Proportional to 891.07, 1,229.72 and 498.11

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Solution

The fourth proportional to 891.07, 1,229.72 and 498.11 is: 687.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.07 : 1,229.72 = 498.11 : x
  2. Step 2: Convert to fraction form
    891.07/1,229.72 = 498.11/x
  3. Step 3: Cross multiply
    891.07x = 1,229.72 × 498.11
  4. Step 4: Simplify right side
    891.07x = 612,527.19
  5. Step 5: Solve for x
    x = 612,527.19/891.07
  6. Step 6: Final answer
    x = 687.41

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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.