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Finding the Third Proportional to 17,617.50 and 18,117

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Solution

The third proportional to 17,617.50 and 18,117 is: 18,630.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,617.50 : 18,117 = 18,117 : x
  2. Step 2: Convert to fraction form
    17,617.50/18,117 = 18,117/x
  3. Step 3: Cross multiply
    17,617.50x = 18,117 × 18,117
  4. Step 4: Simplify right side
    17,617.50x = 328,225,689
  5. Step 5: Solve for x
    x = 328,225,689/17,617.50
  6. Step 6: Final answer
    x = 18,630.66

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.