Home / 20,805.53-31,211.62-6,764.47

Finding the Fourth Proportional to 20,805.53, 31,211.62 and 6,764.47

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Solution

The fourth proportional to 20,805.53, 31,211.62 and 6,764.47 is: 10,147.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.53 : 31,211.62 = 6,764.47 : x
  2. Step 2: Convert to fraction form
    20,805.53/31,211.62 = 6,764.47/x
  3. Step 3: Cross multiply
    20,805.53x = 31,211.62 × 6,764.47
  4. Step 4: Simplify right side
    20,805.53x = 211,129,972.20
  5. Step 5: Solve for x
    x = 211,129,972.20/20,805.53
  6. Step 6: Final answer
    x = 10,147.78

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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.