Home / 20,912.78-28,859.66-11,352.66

Finding the Fourth Proportional to 20,912.78, 28,859.66 and 11,352.66

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Solution

The fourth proportional to 20,912.78, 28,859.66 and 11,352.66 is: 15,666.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.78 : 28,859.66 = 11,352.66 : x
  2. Step 2: Convert to fraction form
    20,912.78/28,859.66 = 11,352.66/x
  3. Step 3: Cross multiply
    20,912.78x = 28,859.66 × 11,352.66
  4. Step 4: Simplify right side
    20,912.78x = 327,633,850.93
  5. Step 5: Solve for x
    x = 327,633,850.93/20,912.78
  6. Step 6: Final answer
    x = 15,666.68

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1.5x scale

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.