Home / 20,917.66-31,380.36-6,878.46

Finding the Fourth Proportional to 20,917.66, 31,380.36 and 6,878.46

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Solution

The fourth proportional to 20,917.66, 31,380.36 and 6,878.46 is: 10,318.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.66 : 31,380.36 = 6,878.46 : x
  2. Step 2: Convert to fraction form
    20,917.66/31,380.36 = 6,878.46/x
  3. Step 3: Cross multiply
    20,917.66x = 31,380.36 × 6,878.46
  4. Step 4: Simplify right side
    20,917.66x = 215,848,551.05
  5. Step 5: Solve for x
    x = 215,848,551.05/20,917.66
  6. Step 6: Final answer
    x = 10,318.96

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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.