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Finding the Third Proportional to 18,720 and 28,688

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Solution

The third proportional to 18,720 and 28,688 is: 43,963.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 28,688 = 28,688 : x
  2. Step 2: Convert to fraction form
    18,720/28,688 = 28,688/x
  3. Step 3: Cross multiply
    18,720x = 28,688 × 28,688
  4. Step 4: Simplify right side
    18,720x = 823,001,344
  5. Step 5: Solve for x
    x = 823,001,344/18,720
  6. Step 6: Final answer
    x = 43,963.75

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.