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Finding the Fourth Proportional to 800.40, 1,103.92 and 676.40

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Solution

The fourth proportional to 800.40, 1,103.92 and 676.40 is: 932.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.40 : 1,103.92 = 676.40 : x
  2. Step 2: Convert to fraction form
    800.40/1,103.92 = 676.40/x
  3. Step 3: Cross multiply
    800.40x = 1,103.92 × 676.40
  4. Step 4: Simplify right side
    800.40x = 746,691.49
  5. Step 5: Solve for x
    x = 746,691.49/800.40
  6. Step 6: Final answer
    x = 932.90

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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.