Home / 20,781.83-31,173.05-5,199.46

Finding the Fourth Proportional to 20,781.83, 31,173.05 and 5,199.46

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Solution

The fourth proportional to 20,781.83, 31,173.05 and 5,199.46 is: 7,799.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.83 : 31,173.05 = 5,199.46 : x
  2. Step 2: Convert to fraction form
    20,781.83/31,173.05 = 5,199.46/x
  3. Step 3: Cross multiply
    20,781.83x = 31,173.05 × 5,199.46
  4. Step 4: Simplify right side
    20,781.83x = 162,082,961.62
  5. Step 5: Solve for x
    x = 162,082,961.62/20,781.83
  6. Step 6: Final answer
    x = 7,799.26

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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.