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Finding the Third Proportional to 15,780 and 18,012

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Solution

The third proportional to 15,780 and 18,012 is: 20,559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780 : 18,012 = 18,012 : x
  2. Step 2: Convert to fraction form
    15,780/18,012 = 18,012/x
  3. Step 3: Cross multiply
    15,780x = 18,012 × 18,012
  4. Step 4: Simplify right side
    15,780x = 324,432,144
  5. Step 5: Solve for x
    x = 324,432,144/15,780
  6. Step 6: Final answer
    x = 20,559.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.