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Finding the Third Proportional to 15,381 and 21,190.50

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Solution

The third proportional to 15,381 and 21,190.50 is: 29,194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,381 : 21,190.50 = 21,190.50 : x
  2. Step 2: Convert to fraction form
    15,381/21,190.50 = 21,190.50/x
  3. Step 3: Cross multiply
    15,381x = 21,190.50 × 21,190.50
  4. Step 4: Simplify right side
    15,381x = 449,037,290.25
  5. Step 5: Solve for x
    x = 449,037,290.25/15,381
  6. Step 6: Final answer
    x = 29,194.28

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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.