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Finding the Third Proportional to 218,265 and 336,408

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Solution

The third proportional to 218,265 and 336,408 is: 518,499.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,265 : 336,408 = 336,408 : x
  2. Step 2: Convert to fraction form
    218,265/336,408 = 336,408/x
  3. Step 3: Cross multiply
    218,265x = 336,408 × 336,408
  4. Step 4: Simplify right side
    218,265x = 113,170,342,464
  5. Step 5: Solve for x
    x = 113,170,342,464/218,265
  6. Step 6: Final answer
    x = 518,499.72

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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.