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Finding the Third Proportional to 13,878 and 15,518

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Solution

The third proportional to 13,878 and 15,518 is: 17,351.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878 : 15,518 = 15,518 : x
  2. Step 2: Convert to fraction form
    13,878/15,518 = 15,518/x
  3. Step 3: Cross multiply
    13,878x = 15,518 × 15,518
  4. Step 4: Simplify right side
    13,878x = 240,808,324
  5. Step 5: Solve for x
    x = 240,808,324/13,878
  6. Step 6: Final answer
    x = 17,351.80

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.