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Finding the Fourth Proportional to 15,960.21, 22,015.41 and 9,986.97

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Solution

The fourth proportional to 15,960.21, 22,015.41 and 9,986.97 is: 13,775.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,960.21 : 22,015.41 = 9,986.97 : x
  2. Step 2: Convert to fraction form
    15,960.21/22,015.41 = 9,986.97/x
  3. Step 3: Cross multiply
    15,960.21x = 22,015.41 × 9,986.97
  4. Step 4: Simplify right side
    15,960.21x = 219,867,239.21
  5. Step 5: Solve for x
    x = 219,867,239.21/15,960.21
  6. Step 6: Final answer
    x = 13,775.96

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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.