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Finding the Fourth Proportional to 894.38, 1,339.85 and 748.20

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Solution

The fourth proportional to 894.38, 1,339.85 and 748.20 is: 1,120.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.38 : 1,339.85 = 748.20 : x
  2. Step 2: Convert to fraction form
    894.38/1,339.85 = 748.20/x
  3. Step 3: Cross multiply
    894.38x = 1,339.85 × 748.20
  4. Step 4: Simplify right side
    894.38x = 1,002,478.86
  5. Step 5: Solve for x
    x = 1,002,478.86/894.38
  6. Step 6: Final answer
    x = 1,120.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.