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Finding the Fourth Proportional to 15,115.56, 20,859.42 and 8,491.56

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Solution

The fourth proportional to 15,115.56, 20,859.42 and 8,491.56 is: 11,718.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.56 : 20,859.42 = 8,491.56 : x
  2. Step 2: Convert to fraction form
    15,115.56/20,859.42 = 8,491.56/x
  3. Step 3: Cross multiply
    15,115.56x = 20,859.42 × 8,491.56
  4. Step 4: Simplify right side
    15,115.56x = 177,129,016.50
  5. Step 5: Solve for x
    x = 177,129,016.50/15,115.56
  6. Step 6: Final answer
    x = 11,718.32

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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.