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Finding the Fourth Proportional to 891.13, 1,229.76 and 498.15

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Solution

The fourth proportional to 891.13, 1,229.76 and 498.15 is: 687.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.13 : 1,229.76 = 498.15 : x
  2. Step 2: Convert to fraction form
    891.13/1,229.76 = 498.15/x
  3. Step 3: Cross multiply
    891.13x = 1,229.76 × 498.15
  4. Step 4: Simplify right side
    891.13x = 612,603.54
  5. Step 5: Solve for x
    x = 612,603.54/891.13
  6. Step 6: Final answer
    x = 687.45

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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.