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Finding the Third Proportional to 138,315 and 213,612

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Solution

The third proportional to 138,315 and 213,612 is: 329,899.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,315 : 213,612 = 213,612 : x
  2. Step 2: Convert to fraction form
    138,315/213,612 = 213,612/x
  3. Step 3: Cross multiply
    138,315x = 213,612 × 213,612
  4. Step 4: Simplify right side
    138,315x = 45,630,086,544
  5. Step 5: Solve for x
    x = 45,630,086,544/138,315
  6. Step 6: Final answer
    x = 329,899.77

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.