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Finding the Third Proportional to 15,723 and 18,518

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Solution

The third proportional to 15,723 and 18,518 is: 21,809.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,723 : 18,518 = 18,518 : x
  2. Step 2: Convert to fraction form
    15,723/18,518 = 18,518/x
  3. Step 3: Cross multiply
    15,723x = 18,518 × 18,518
  4. Step 4: Simplify right side
    15,723x = 342,916,324
  5. Step 5: Solve for x
    x = 342,916,324/15,723
  6. Step 6: Final answer
    x = 21,809.85

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.