Home / 20,979.38-31,461.57-6,936.81

Finding the Fourth Proportional to 20,979.38, 31,461.57 and 6,936.81

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Solution

The fourth proportional to 20,979.38, 31,461.57 and 6,936.81 is: 10,402.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.38 : 31,461.57 = 6,936.81 : x
  2. Step 2: Convert to fraction form
    20,979.38/31,461.57 = 6,936.81/x
  3. Step 3: Cross multiply
    20,979.38x = 31,461.57 × 6,936.81
  4. Step 4: Simplify right side
    20,979.38x = 218,242,992.38
  5. Step 5: Solve for x
    x = 218,242,992.38/20,979.38
  6. Step 6: Final answer
    x = 10,402.74

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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.