Home / 28,540.12-39,381.99-15,791.61

Finding the Fourth Proportional to 28,540.12, 39,381.99 and 15,791.61

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Solution

The fourth proportional to 28,540.12, 39,381.99 and 15,791.61 is: 21,790.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,540.12 : 39,381.99 = 15,791.61 : x
  2. Step 2: Convert to fraction form
    28,540.12/39,381.99 = 15,791.61/x
  3. Step 3: Cross multiply
    28,540.12x = 39,381.99 × 15,791.61
  4. Step 4: Simplify right side
    28,540.12x = 621,905,027.10
  5. Step 5: Solve for x
    x = 621,905,027.10/28,540.12
  6. Step 6: Final answer
    x = 21,790.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.