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Finding the Third Proportional to 218,311 and 328,276

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Solution

The third proportional to 218,311 and 328,276 is: 493,631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,311 : 328,276 = 328,276 : x
  2. Step 2: Convert to fraction form
    218,311/328,276 = 328,276/x
  3. Step 3: Cross multiply
    218,311x = 328,276 × 328,276
  4. Step 4: Simplify right side
    218,311x = 107,765,132,176
  5. Step 5: Solve for x
    x = 107,765,132,176/218,311
  6. Step 6: Final answer
    x = 493,631.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.