Home / 12,320.40-18,480.60-12,190.80

Finding the Fourth Proportional to 12,320.40, 18,480.60 and 12,190.80

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Solution

The fourth proportional to 12,320.40, 18,480.60 and 12,190.80 is: 18,286.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,320.40 : 18,480.60 = 12,190.80 : x
  2. Step 2: Convert to fraction form
    12,320.40/18,480.60 = 12,190.80/x
  3. Step 3: Cross multiply
    12,320.40x = 18,480.60 × 12,190.80
  4. Step 4: Simplify right side
    12,320.40x = 225,293,298.48
  5. Step 5: Solve for x
    x = 225,293,298.48/12,320.40
  6. Step 6: Final answer
    x = 18,286.20

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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.