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Finding the Fourth Proportional to 15,211.56, 20,986.18 and 9,910.92

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Solution

The fourth proportional to 15,211.56, 20,986.18 and 9,910.92 is: 13,673.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.56 : 20,986.18 = 9,910.92 : x
  2. Step 2: Convert to fraction form
    15,211.56/20,986.18 = 9,910.92/x
  3. Step 3: Cross multiply
    15,211.56x = 20,986.18 × 9,910.92
  4. Step 4: Simplify right side
    15,211.56x = 207,992,351.09
  5. Step 5: Solve for x
    x = 207,992,351.09/15,211.56
  6. Step 6: Final answer
    x = 13,673.31

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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.