Home / 20,949.20-31,420.22-6,909.38

Finding the Fourth Proportional to 20,949.20, 31,420.22 and 6,909.38

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Solution

The fourth proportional to 20,949.20, 31,420.22 and 6,909.38 is: 10,362.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.20 : 31,420.22 = 6,909.38 : x
  2. Step 2: Convert to fraction form
    20,949.20/31,420.22 = 6,909.38/x
  3. Step 3: Cross multiply
    20,949.20x = 31,420.22 × 6,909.38
  4. Step 4: Simplify right side
    20,949.20x = 217,094,239.66
  5. Step 5: Solve for x
    x = 217,094,239.66/20,949.20
  6. Step 6: Final answer
    x = 10,362.89

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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.