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Finding the Third Proportional to 18,120 and 27,720.50

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Solution

The third proportional to 18,120 and 27,720.50 is: 42,407.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,120 : 27,720.50 = 27,720.50 : x
  2. Step 2: Convert to fraction form
    18,120/27,720.50 = 27,720.50/x
  3. Step 3: Cross multiply
    18,120x = 27,720.50 × 27,720.50
  4. Step 4: Simplify right side
    18,120x = 768,426,120.25
  5. Step 5: Solve for x
    x = 768,426,120.25/18,120
  6. Step 6: Final answer
    x = 42,407.62

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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.