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Finding the Fourth Proportional to 15,790.75, 21,790.89 and 8,620.42

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Solution

The fourth proportional to 15,790.75, 21,790.89 and 8,620.42 is: 11,895.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.75 : 21,790.89 = 8,620.42 : x
  2. Step 2: Convert to fraction form
    15,790.75/21,790.89 = 8,620.42/x
  3. Step 3: Cross multiply
    15,790.75x = 21,790.89 × 8,620.42
  4. Step 4: Simplify right side
    15,790.75x = 187,846,623.97
  5. Step 5: Solve for x
    x = 187,846,623.97/15,790.75
  6. Step 6: Final answer
    x = 11,895.99

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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.