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Finding the Third Proportional to 12,836 and 15,780

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Solution

The third proportional to 12,836 and 15,780 is: 19,399.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,836 : 15,780 = 15,780 : x
  2. Step 2: Convert to fraction form
    12,836/15,780 = 15,780/x
  3. Step 3: Cross multiply
    12,836x = 15,780 × 15,780
  4. Step 4: Simplify right side
    12,836x = 249,008,400
  5. Step 5: Solve for x
    x = 249,008,400/12,836
  6. Step 6: Final answer
    x = 19,399.22

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.