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Finding the Third Proportional to 11,700 and 18,120

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Solution

The third proportional to 11,700 and 18,120 is: 28,062.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,700 : 18,120 = 18,120 : x
  2. Step 2: Convert to fraction form
    11,700/18,120 = 18,120/x
  3. Step 3: Cross multiply
    11,700x = 18,120 × 18,120
  4. Step 4: Simplify right side
    11,700x = 328,334,400
  5. Step 5: Solve for x
    x = 328,334,400/11,700
  6. Step 6: Final answer
    x = 28,062.77

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.