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Finding the Third Proportional to 15,123 and 21,153

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Solution

The third proportional to 15,123 and 21,153 is: 29,587.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123 : 21,153 = 21,153 : x
  2. Step 2: Convert to fraction form
    15,123/21,153 = 21,153/x
  3. Step 3: Cross multiply
    15,123x = 21,153 × 21,153
  4. Step 4: Simplify right side
    15,123x = 447,449,409
  5. Step 5: Solve for x
    x = 447,449,409/15,123
  6. Step 6: Final answer
    x = 29,587.34

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.