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Finding the Fourth Proportional to 15,789.78, 21,790.08 and 8,716.22

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Solution

The fourth proportional to 15,789.78, 21,790.08 and 8,716.22 is: 12,028.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.78 : 21,790.08 = 8,716.22 : x
  2. Step 2: Convert to fraction form
    15,789.78/21,790.08 = 8,716.22/x
  3. Step 3: Cross multiply
    15,789.78x = 21,790.08 × 8,716.22
  4. Step 4: Simplify right side
    15,789.78x = 189,927,131.10
  5. Step 5: Solve for x
    x = 189,927,131.10/15,789.78
  6. Step 6: Final answer
    x = 12,028.48

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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.