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Finding the Third Proportional to 21,720 and 36,072

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Solution

The third proportional to 21,720 and 36,072 is: 59,907.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720 : 36,072 = 36,072 : x
  2. Step 2: Convert to fraction form
    21,720/36,072 = 36,072/x
  3. Step 3: Cross multiply
    21,720x = 36,072 × 36,072
  4. Step 4: Simplify right side
    21,720x = 1,301,189,184
  5. Step 5: Solve for x
    x = 1,301,189,184/21,720
  6. Step 6: Final answer
    x = 59,907.42

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.