Home / 20,979.78-31,462.88-6,936.54

Finding the Fourth Proportional to 20,979.78, 31,462.88 and 6,936.54

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Solution

The fourth proportional to 20,979.78, 31,462.88 and 6,936.54 is: 10,402.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.78 : 31,462.88 = 6,936.54 : x
  2. Step 2: Convert to fraction form
    20,979.78/31,462.88 = 6,936.54/x
  3. Step 3: Cross multiply
    20,979.78x = 31,462.88 × 6,936.54
  4. Step 4: Simplify right side
    20,979.78x = 218,243,490.95
  5. Step 5: Solve for x
    x = 218,243,490.95/20,979.78
  6. Step 6: Final answer
    x = 10,402.56

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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.