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Finding the Third Proportional to 17,280 and 18,688

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Solution

The third proportional to 17,280 and 18,688 is: 20,210.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,280 : 18,688 = 18,688 : x
  2. Step 2: Convert to fraction form
    17,280/18,688 = 18,688/x
  3. Step 3: Cross multiply
    17,280x = 18,688 × 18,688
  4. Step 4: Simplify right side
    17,280x = 349,241,344
  5. Step 5: Solve for x
    x = 349,241,344/17,280
  6. Step 6: Final answer
    x = 20,210.73

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.