Home / 20,839.80-31,259.70-12,529.20

Finding the Fourth Proportional to 20,839.80, 31,259.70 and 12,529.20

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Solution

The fourth proportional to 20,839.80, 31,259.70 and 12,529.20 is: 18,793.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,839.80 : 31,259.70 = 12,529.20 : x
  2. Step 2: Convert to fraction form
    20,839.80/31,259.70 = 12,529.20/x
  3. Step 3: Cross multiply
    20,839.80x = 31,259.70 × 12,529.20
  4. Step 4: Simplify right side
    20,839.80x = 391,659,033.24
  5. Step 5: Solve for x
    x = 391,659,033.24/20,839.80
  6. Step 6: Final answer
    x = 18,793.80

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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.