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Finding the Third Proportional to 13,220 and 19,788

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Solution

The third proportional to 13,220 and 19,788 is: 29,619.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,220 : 19,788 = 19,788 : x
  2. Step 2: Convert to fraction form
    13,220/19,788 = 19,788/x
  3. Step 3: Cross multiply
    13,220x = 19,788 × 19,788
  4. Step 4: Simplify right side
    13,220x = 391,564,944
  5. Step 5: Solve for x
    x = 391,564,944/13,220
  6. Step 6: Final answer
    x = 29,619.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.