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Finding the Fourth Proportional to 2,640.92, 3,961.38 and 885.92

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Solution

The fourth proportional to 2,640.92, 3,961.38 and 885.92 is: 1,328.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.92 : 3,961.38 = 885.92 : x
  2. Step 2: Convert to fraction form
    2,640.92/3,961.38 = 885.92/x
  3. Step 3: Cross multiply
    2,640.92x = 3,961.38 × 885.92
  4. Step 4: Simplify right side
    2,640.92x = 3,509,465.77
  5. Step 5: Solve for x
    x = 3,509,465.77/2,640.92
  6. Step 6: Final answer
    x = 1,328.88

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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.