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Finding the Fourth Proportional to 15,789.88, 21,790.06 and 8,716.30

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Solution

The fourth proportional to 15,789.88, 21,790.06 and 8,716.30 is: 12,028.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.88 : 21,790.06 = 8,716.30 : x
  2. Step 2: Convert to fraction form
    15,789.88/21,790.06 = 8,716.30/x
  3. Step 3: Cross multiply
    15,789.88x = 21,790.06 × 8,716.30
  4. Step 4: Simplify right side
    15,789.88x = 189,928,699.98
  5. Step 5: Solve for x
    x = 189,928,699.98/15,789.88
  6. Step 6: Final answer
    x = 12,028.51

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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.