Home / 12,439.60-18,659.40-7,190.80

Finding the Fourth Proportional to 12,439.60, 18,659.40 and 7,190.80

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Solution

The fourth proportional to 12,439.60, 18,659.40 and 7,190.80 is: 10,786.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,439.60 : 18,659.40 = 7,190.80 : x
  2. Step 2: Convert to fraction form
    12,439.60/18,659.40 = 7,190.80/x
  3. Step 3: Cross multiply
    12,439.60x = 18,659.40 × 7,190.80
  4. Step 4: Simplify right side
    12,439.60x = 134,176,013.52
  5. Step 5: Solve for x
    x = 134,176,013.52/12,439.60
  6. Step 6: Final answer
    x = 10,786.20

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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.