Home / 20,868.80-31,298.24-8,388.86

Finding the Fourth Proportional to 20,868.80, 31,298.24 and 8,388.86

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Solution

The fourth proportional to 20,868.80, 31,298.24 and 8,388.86 is: 12,581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.80 : 31,298.24 = 8,388.86 : x
  2. Step 2: Convert to fraction form
    20,868.80/31,298.24 = 8,388.86/x
  3. Step 3: Cross multiply
    20,868.80x = 31,298.24 × 8,388.86
  4. Step 4: Simplify right side
    20,868.80x = 262,556,553.61
  5. Step 5: Solve for x
    x = 262,556,553.61/20,868.80
  6. Step 6: Final answer
    x = 12,581.30

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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.