Home / 13,426.20-20,139.30-11,287.80

Finding the Fourth Proportional to 13,426.20, 20,139.30 and 11,287.80

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Solution

The fourth proportional to 13,426.20, 20,139.30 and 11,287.80 is: 16,931.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,426.20 : 20,139.30 = 11,287.80 : x
  2. Step 2: Convert to fraction form
    13,426.20/20,139.30 = 11,287.80/x
  3. Step 3: Cross multiply
    13,426.20x = 20,139.30 × 11,287.80
  4. Step 4: Simplify right side
    13,426.20x = 227,328,390.54
  5. Step 5: Solve for x
    x = 227,328,390.54/13,426.20
  6. Step 6: Final answer
    x = 16,931.70

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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.