Home / 20,936.86-31,407.34-6,891.15

Finding the Fourth Proportional to 20,936.86, 31,407.34 and 6,891.15

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Solution

The fourth proportional to 20,936.86, 31,407.34 and 6,891.15 is: 10,337.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,936.86 : 31,407.34 = 6,891.15 : x
  2. Step 2: Convert to fraction form
    20,936.86/31,407.34 = 6,891.15/x
  3. Step 3: Cross multiply
    20,936.86x = 31,407.34 × 6,891.15
  4. Step 4: Simplify right side
    20,936.86x = 216,432,785.13
  5. Step 5: Solve for x
    x = 216,432,785.13/20,936.86
  6. Step 6: Final answer
    x = 10,337.41

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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.