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Finding the Fourth Proportional to 2,649.74, 3,974.60 and 918.36

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Solution

The fourth proportional to 2,649.74, 3,974.60 and 918.36 is: 1,377.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,649.74 : 3,974.60 = 918.36 : x
  2. Step 2: Convert to fraction form
    2,649.74/3,974.60 = 918.36/x
  3. Step 3: Cross multiply
    2,649.74x = 3,974.60 × 918.36
  4. Step 4: Simplify right side
    2,649.74x = 3,650,115.95
  5. Step 5: Solve for x
    x = 3,650,115.95/2,649.74
  6. Step 6: Final answer
    x = 1,377.54

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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.