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Finding the Fourth Proportional to 891.20, 1,229.68 and 518.13

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Solution

The fourth proportional to 891.20, 1,229.68 and 518.13 is: 714.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.20 : 1,229.68 = 518.13 : x
  2. Step 2: Convert to fraction form
    891.20/1,229.68 = 518.13/x
  3. Step 3: Cross multiply
    891.20x = 1,229.68 × 518.13
  4. Step 4: Simplify right side
    891.20x = 637,134.75
  5. Step 5: Solve for x
    x = 637,134.75/891.20
  6. Step 6: Final answer
    x = 714.92

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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.