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Finding the Fourth Proportional to 2,641.20, 3,961.80 and 792.14

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Solution

The fourth proportional to 2,641.20, 3,961.80 and 792.14 is: 1,188.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,641.20 : 3,961.80 = 792.14 : x
  2. Step 2: Convert to fraction form
    2,641.20/3,961.80 = 792.14/x
  3. Step 3: Cross multiply
    2,641.20x = 3,961.80 × 792.14
  4. Step 4: Simplify right side
    2,641.20x = 3,138,300.25
  5. Step 5: Solve for x
    x = 3,138,300.25/2,641.20
  6. Step 6: Final answer
    x = 1,188.21

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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.