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Finding the Fourth Proportional to 2,640.39, 3,961.64 and 997.40

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Solution

The fourth proportional to 2,640.39, 3,961.64 and 997.40 is: 1,496.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.39 : 3,961.64 = 997.40 : x
  2. Step 2: Convert to fraction form
    2,640.39/3,961.64 = 997.40/x
  3. Step 3: Cross multiply
    2,640.39x = 3,961.64 × 997.40
  4. Step 4: Simplify right side
    2,640.39x = 3,951,339.74
  5. Step 5: Solve for x
    x = 3,951,339.74/2,640.39
  6. Step 6: Final answer
    x = 1,496.50

Related Problems

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Half scale
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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.