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Finding the Third Proportional to 28,400 and 43,929

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Solution

The third proportional to 28,400 and 43,929 is: 67,949.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,400 : 43,929 = 43,929 : x
  2. Step 2: Convert to fraction form
    28,400/43,929 = 43,929/x
  3. Step 3: Cross multiply
    28,400x = 43,929 × 43,929
  4. Step 4: Simplify right side
    28,400x = 1,929,757,041
  5. Step 5: Solve for x
    x = 1,929,757,041/28,400
  6. Step 6: Final answer
    x = 67,949.19

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.