Home / 20,861.88-31,218.30-18,120.84

Finding the Fourth Proportional to 20,861.88, 31,218.30 and 18,120.84

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Solution

The fourth proportional to 20,861.88, 31,218.30 and 18,120.84 is: 27,116.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.88 : 31,218.30 = 18,120.84 : x
  2. Step 2: Convert to fraction form
    20,861.88/31,218.30 = 18,120.84/x
  3. Step 3: Cross multiply
    20,861.88x = 31,218.30 × 18,120.84
  4. Step 4: Simplify right side
    20,861.88x = 565,701,819.37
  5. Step 5: Solve for x
    x = 565,701,819.37/20,861.88
  6. Step 6: Final answer
    x = 27,116.53

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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.