Home / 20,917.40-31,379.99-6,878.21

Finding the Fourth Proportional to 20,917.40, 31,379.99 and 6,878.21

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Solution

The fourth proportional to 20,917.40, 31,379.99 and 6,878.21 is: 10,318.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.40 : 31,379.99 = 6,878.21 : x
  2. Step 2: Convert to fraction form
    20,917.40/31,379.99 = 6,878.21/x
  3. Step 3: Cross multiply
    20,917.40x = 31,379.99 × 6,878.21
  4. Step 4: Simplify right side
    20,917.40x = 215,838,161.02
  5. Step 5: Solve for x
    x = 215,838,161.02/20,917.40
  6. Step 6: Final answer
    x = 10,318.59

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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.