Home / 20,517.20-30,743.40-13,108.40

Finding the Fourth Proportional to 20,517.20, 30,743.40 and 13,108.40

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Solution

The fourth proportional to 20,517.20, 30,743.40 and 13,108.40 is: 19,641.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,517.20 : 30,743.40 = 13,108.40 : x
  2. Step 2: Convert to fraction form
    20,517.20/30,743.40 = 13,108.40/x
  3. Step 3: Cross multiply
    20,517.20x = 30,743.40 × 13,108.40
  4. Step 4: Simplify right side
    20,517.20x = 402,996,784.56
  5. Step 5: Solve for x
    x = 402,996,784.56/20,517.20
  6. Step 6: Final answer
    x = 19,641.90

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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.