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Finding the Third Proportional to 138,600 and 210,816

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Solution

The third proportional to 138,600 and 210,816 is: 320,659.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,600 : 210,816 = 210,816 : x
  2. Step 2: Convert to fraction form
    138,600/210,816 = 210,816/x
  3. Step 3: Cross multiply
    138,600x = 210,816 × 210,816
  4. Step 4: Simplify right side
    138,600x = 44,443,385,856
  5. Step 5: Solve for x
    x = 44,443,385,856/138,600
  6. Step 6: Final answer
    x = 320,659.35

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.