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Finding the Third Proportional to 13,980 and 16,428

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Solution

The third proportional to 13,980 and 16,428 is: 19,304.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,980 : 16,428 = 16,428 : x
  2. Step 2: Convert to fraction form
    13,980/16,428 = 16,428/x
  3. Step 3: Cross multiply
    13,980x = 16,428 × 16,428
  4. Step 4: Simplify right side
    13,980x = 269,879,184
  5. Step 5: Solve for x
    x = 269,879,184/13,980
  6. Step 6: Final answer
    x = 19,304.66

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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.