Home / 20,821.67-31,234.39-6,778.06

Finding the Fourth Proportional to 20,821.67, 31,234.39 and 6,778.06

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Solution

The fourth proportional to 20,821.67, 31,234.39 and 6,778.06 is: 10,167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.67 : 31,234.39 = 6,778.06 : x
  2. Step 2: Convert to fraction form
    20,821.67/31,234.39 = 6,778.06/x
  3. Step 3: Cross multiply
    20,821.67x = 31,234.39 × 6,778.06
  4. Step 4: Simplify right side
    20,821.67x = 211,708,569.48
  5. Step 5: Solve for x
    x = 211,708,569.48/20,821.67
  6. Step 6: Final answer
    x = 10,167.70

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1.5x scale

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.