Home / 20,781.38-31,171.86-5,199.01

Finding the Fourth Proportional to 20,781.38, 31,171.86 and 5,199.01

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Solution

The fourth proportional to 20,781.38, 31,171.86 and 5,199.01 is: 7,798.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.38 : 31,171.86 = 5,199.01 : x
  2. Step 2: Convert to fraction form
    20,781.38/31,171.86 = 5,199.01/x
  3. Step 3: Cross multiply
    20,781.38x = 31,171.86 × 5,199.01
  4. Step 4: Simplify right side
    20,781.38x = 162,062,733.93
  5. Step 5: Solve for x
    x = 162,062,733.93/20,781.38
  6. Step 6: Final answer
    x = 7,798.46

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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.