Home / 20,811.40-31,217.10-12,041.80

Finding the Fourth Proportional to 20,811.40, 31,217.10 and 12,041.80

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Solution

The fourth proportional to 20,811.40, 31,217.10 and 12,041.80 is: 18,062.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.40 : 31,217.10 = 12,041.80 : x
  2. Step 2: Convert to fraction form
    20,811.40/31,217.10 = 12,041.80/x
  3. Step 3: Cross multiply
    20,811.40x = 31,217.10 × 12,041.80
  4. Step 4: Simplify right side
    20,811.40x = 375,910,074.78
  5. Step 5: Solve for x
    x = 375,910,074.78/20,811.40
  6. Step 6: Final answer
    x = 18,062.70

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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.