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Finding the Third Proportional to 20,790 and 45,135

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Solution

The third proportional to 20,790 and 45,135 is: 97,987.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790 : 45,135 = 45,135 : x
  2. Step 2: Convert to fraction form
    20,790/45,135 = 45,135/x
  3. Step 3: Cross multiply
    20,790x = 45,135 × 45,135
  4. Step 4: Simplify right side
    20,790x = 2,037,168,225
  5. Step 5: Solve for x
    x = 2,037,168,225/20,790
  6. Step 6: Final answer
    x = 97,987.89

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.