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Finding the Fourth Proportional to 21,115.44, 29,138.10 and 11,683.44

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Solution

The fourth proportional to 21,115.44, 29,138.10 and 11,683.44 is: 16,122.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.44 : 29,138.10 = 11,683.44 : x
  2. Step 2: Convert to fraction form
    21,115.44/29,138.10 = 11,683.44/x
  3. Step 3: Cross multiply
    21,115.44x = 29,138.10 × 11,683.44
  4. Step 4: Simplify right side
    21,115.44x = 340,433,243.06
  5. Step 5: Solve for x
    x = 340,433,243.06/21,115.44
  6. Step 6: Final answer
    x = 16,122.48

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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.