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Finding the Fourth Proportional to 891.72, 1,229.76 and 612.30

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Solution

The fourth proportional to 891.72, 1,229.76 and 612.30 is: 844.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.72 : 1,229.76 = 612.30 : x
  2. Step 2: Convert to fraction form
    891.72/1,229.76 = 612.30/x
  3. Step 3: Cross multiply
    891.72x = 1,229.76 × 612.30
  4. Step 4: Simplify right side
    891.72x = 752,982.05
  5. Step 5: Solve for x
    x = 752,982.05/891.72
  6. Step 6: Final answer
    x = 844.42

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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.