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Finding the Fourth Proportional to 20,699.78, 31,034.21 and 6,651.79

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Solution

The fourth proportional to 20,699.78, 31,034.21 and 6,651.79 is: 9,972.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.78 : 31,034.21 = 6,651.79 : x
  2. Step 2: Convert to fraction form
    20,699.78/31,034.21 = 6,651.79/x
  3. Step 3: Cross multiply
    20,699.78x = 31,034.21 × 6,651.79
  4. Step 4: Simplify right side
    20,699.78x = 206,432,936.89
  5. Step 5: Solve for x
    x = 206,432,936.89/20,699.78
  6. Step 6: Final answer
    x = 9,972.71

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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.