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Finding the Fourth Proportional to 891.21, 1,229.78 and 611.69

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Solution

The fourth proportional to 891.21, 1,229.78 and 611.69 is: 844.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.21 : 1,229.78 = 611.69 : x
  2. Step 2: Convert to fraction form
    891.21/1,229.78 = 611.69/x
  3. Step 3: Cross multiply
    891.21x = 1,229.78 × 611.69
  4. Step 4: Simplify right side
    891.21x = 752,244.13
  5. Step 5: Solve for x
    x = 752,244.13/891.21
  6. Step 6: Final answer
    x = 844.07

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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.