Home / 12,439.40-18,659.10-4,120.70

Finding the Fourth Proportional to 12,439.40, 18,659.10 and 4,120.70

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Solution

The fourth proportional to 12,439.40, 18,659.10 and 4,120.70 is: 6,181.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,439.40 : 18,659.10 = 4,120.70 : x
  2. Step 2: Convert to fraction form
    12,439.40/18,659.10 = 4,120.70/x
  3. Step 3: Cross multiply
    12,439.40x = 18,659.10 × 4,120.70
  4. Step 4: Simplify right side
    12,439.40x = 76,888,553.37
  5. Step 5: Solve for x
    x = 76,888,553.37/12,439.40
  6. Step 6: Final answer
    x = 6,181.05

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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.