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Finding the Third Proportional to 18,720 and 27,312

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Solution

The third proportional to 18,720 and 27,312 is: 39,847.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 27,312 = 27,312 : x
  2. Step 2: Convert to fraction form
    18,720/27,312 = 27,312/x
  3. Step 3: Cross multiply
    18,720x = 27,312 × 27,312
  4. Step 4: Simplify right side
    18,720x = 745,945,344
  5. Step 5: Solve for x
    x = 745,945,344/18,720
  6. Step 6: Final answer
    x = 39,847.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.