Home / 15,789.90-21,790.32-8,716.38

Finding the Fourth Proportional to 15,789.90, 21,790.32 and 8,716.38

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Solution

The fourth proportional to 15,789.90, 21,790.32 and 8,716.38 is: 12,028.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.90 : 21,790.32 = 8,716.38 : x
  2. Step 2: Convert to fraction form
    15,789.90/21,790.32 = 8,716.38/x
  3. Step 3: Cross multiply
    15,789.90x = 21,790.32 × 8,716.38
  4. Step 4: Simplify right side
    15,789.90x = 189,932,709.44
  5. Step 5: Solve for x
    x = 189,932,709.44/15,789.90
  6. Step 6: Final answer
    x = 12,028.75

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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.