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Finding the Fourth Proportional to 891.10, 1,229.68 and 498.10

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Solution

The fourth proportional to 891.10, 1,229.68 and 498.10 is: 687.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.10 : 1,229.68 = 498.10 : x
  2. Step 2: Convert to fraction form
    891.10/1,229.68 = 498.10/x
  3. Step 3: Cross multiply
    891.10x = 1,229.68 × 498.10
  4. Step 4: Simplify right side
    891.10x = 612,503.61
  5. Step 5: Solve for x
    x = 612,503.61/891.10
  6. Step 6: Final answer
    x = 687.36

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1.5x scale

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.