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Finding the Fourth Proportional to 2,649.92, 3,974.89 and 918.55

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Solution

The fourth proportional to 2,649.92, 3,974.89 and 918.55 is: 1,377.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,649.92 : 3,974.89 = 918.55 : x
  2. Step 2: Convert to fraction form
    2,649.92/3,974.89 = 918.55/x
  3. Step 3: Cross multiply
    2,649.92x = 3,974.89 × 918.55
  4. Step 4: Simplify right side
    2,649.92x = 3,651,135.21
  5. Step 5: Solve for x
    x = 3,651,135.21/2,649.92
  6. Step 6: Final answer
    x = 1,377.83

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Double scale
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Similar ratio
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1.5x scale

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.