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Finding the Fourth Proportional to 21,481.27, 29,644.49 and 12,982.21

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Solution

The fourth proportional to 21,481.27, 29,644.49 and 12,982.21 is: 17,915.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,481.27 : 29,644.49 = 12,982.21 : x
  2. Step 2: Convert to fraction form
    21,481.27/29,644.49 = 12,982.21/x
  3. Step 3: Cross multiply
    21,481.27x = 29,644.49 × 12,982.21
  4. Step 4: Simplify right side
    21,481.27x = 384,850,994.52
  5. Step 5: Solve for x
    x = 384,850,994.52/21,481.27
  6. Step 6: Final answer
    x = 17,915.65

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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.