Home / 20,724.60-31,086.90-18,910.20

Finding the Fourth Proportional to 20,724.60, 31,086.90 and 18,910.20

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Solution

The fourth proportional to 20,724.60, 31,086.90 and 18,910.20 is: 28,365.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,724.60 : 31,086.90 = 18,910.20 : x
  2. Step 2: Convert to fraction form
    20,724.60/31,086.90 = 18,910.20/x
  3. Step 3: Cross multiply
    20,724.60x = 31,086.90 × 18,910.20
  4. Step 4: Simplify right side
    20,724.60x = 587,859,496.38
  5. Step 5: Solve for x
    x = 587,859,496.38/20,724.60
  6. Step 6: Final answer
    x = 28,365.30

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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.