Home / 20,819.76-31,242.60-6,978.48

Finding the Fourth Proportional to 20,819.76, 31,242.60 and 6,978.48

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Solution

The fourth proportional to 20,819.76, 31,242.60 and 6,978.48 is: 10,472.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.76 : 31,242.60 = 6,978.48 : x
  2. Step 2: Convert to fraction form
    20,819.76/31,242.60 = 6,978.48/x
  3. Step 3: Cross multiply
    20,819.76x = 31,242.60 × 6,978.48
  4. Step 4: Simplify right side
    20,819.76x = 218,025,859.25
  5. Step 5: Solve for x
    x = 218,025,859.25/20,819.76
  6. Step 6: Final answer
    x = 10,472.06

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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.