Home / 20,778.20-31,171.44-7,447.62

Finding the Fourth Proportional to 20,778.20, 31,171.44 and 7,447.62

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Solution

The fourth proportional to 20,778.20, 31,171.44 and 7,447.62 is: 11,172.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.20 : 31,171.44 = 7,447.62 : x
  2. Step 2: Convert to fraction form
    20,778.20/31,171.44 = 7,447.62/x
  3. Step 3: Cross multiply
    20,778.20x = 31,171.44 × 7,447.62
  4. Step 4: Simplify right side
    20,778.20x = 232,153,039.97
  5. Step 5: Solve for x
    x = 232,153,039.97/20,778.20
  6. Step 6: Final answer
    x = 11,172.91

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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.