Home / 20,781.97-31,185.25-7,643.57

Finding the Fourth Proportional to 20,781.97, 31,185.25 and 7,643.57

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Solution

The fourth proportional to 20,781.97, 31,185.25 and 7,643.57 is: 11,469.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.97 : 31,185.25 = 7,643.57 : x
  2. Step 2: Convert to fraction form
    20,781.97/31,185.25 = 7,643.57/x
  3. Step 3: Cross multiply
    20,781.97x = 31,185.25 × 7,643.57
  4. Step 4: Simplify right side
    20,781.97x = 238,366,509.30
  5. Step 5: Solve for x
    x = 238,366,509.30/20,781.97
  6. Step 6: Final answer
    x = 11,469.87

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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.