Home / 20,781.92-31,172.94-5,199.54

Finding the Fourth Proportional to 20,781.92, 31,172.94 and 5,199.54

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Solution

The fourth proportional to 20,781.92, 31,172.94 and 5,199.54 is: 7,799.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.92 : 31,172.94 = 5,199.54 : x
  2. Step 2: Convert to fraction form
    20,781.92/31,172.94 = 5,199.54/x
  3. Step 3: Cross multiply
    20,781.92x = 31,172.94 × 5,199.54
  4. Step 4: Simplify right side
    20,781.92x = 162,084,948.45
  5. Step 5: Solve for x
    x = 162,084,948.45/20,781.92
  6. Step 6: Final answer
    x = 7,799.33

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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.