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Finding the Fourth Proportional to 891.09, 1,229.71 and 487.33

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Solution

The fourth proportional to 891.09, 1,229.71 and 487.33 is: 672.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.09 : 1,229.71 = 487.33 : x
  2. Step 2: Convert to fraction form
    891.09/1,229.71 = 487.33/x
  3. Step 3: Cross multiply
    891.09x = 1,229.71 × 487.33
  4. Step 4: Simplify right side
    891.09x = 599,265.99
  5. Step 5: Solve for x
    x = 599,265.99/891.09
  6. Step 6: Final answer
    x = 672.51

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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.