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Finding the Fourth Proportional to 891.15, 1,229.61 and 518.13

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Solution

The fourth proportional to 891.15, 1,229.61 and 518.13 is: 714.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.15 : 1,229.61 = 518.13 : x
  2. Step 2: Convert to fraction form
    891.15/1,229.61 = 518.13/x
  3. Step 3: Cross multiply
    891.15x = 1,229.61 × 518.13
  4. Step 4: Simplify right side
    891.15x = 637,097.83
  5. Step 5: Solve for x
    x = 637,097.83/891.15
  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.