Home / 20,886.86-31,338.18-12,572.75

Finding the Fourth Proportional to 20,886.86, 31,338.18 and 12,572.75

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Solution

The fourth proportional to 20,886.86, 31,338.18 and 12,572.75 is: 18,863.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.86 : 31,338.18 = 12,572.75 : x
  2. Step 2: Convert to fraction form
    20,886.86/31,338.18 = 12,572.75/x
  3. Step 3: Cross multiply
    20,886.86x = 31,338.18 × 12,572.75
  4. Step 4: Simplify right side
    20,886.86x = 394,006,945.90
  5. Step 5: Solve for x
    x = 394,006,945.90/20,886.86
  6. Step 6: Final answer
    x = 18,863.87

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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.