Home / 6,439.40-9,659.10-3,966.20

Finding the Fourth Proportional to 6,439.40, 9,659.10 and 3,966.20

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Solution

The fourth proportional to 6,439.40, 9,659.10 and 3,966.20 is: 5,949.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,439.40 : 9,659.10 = 3,966.20 : x
  2. Step 2: Convert to fraction form
    6,439.40/9,659.10 = 3,966.20/x
  3. Step 3: Cross multiply
    6,439.40x = 9,659.10 × 3,966.20
  4. Step 4: Simplify right side
    6,439.40x = 38,309,922.42
  5. Step 5: Solve for x
    x = 38,309,922.42/6,439.40
  6. Step 6: Final answer
    x = 5,949.30

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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.