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Finding the Fourth Proportional to 891.15, 1,229.82 and 559.46

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Solution

The fourth proportional to 891.15, 1,229.82 and 559.46 is: 772.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.15 : 1,229.82 = 559.46 : x
  2. Step 2: Convert to fraction form
    891.15/1,229.82 = 559.46/x
  3. Step 3: Cross multiply
    891.15x = 1,229.82 × 559.46
  4. Step 4: Simplify right side
    891.15x = 688,028.95
  5. Step 5: Solve for x
    x = 688,028.95/891.15
  6. Step 6: Final answer
    x = 772.07

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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.