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Finding the Third Proportional to 240,408 and 428,328

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Solution

The third proportional to 240,408 and 428,328 is: 763,139.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    240,408 : 428,328 = 428,328 : x
  2. Step 2: Convert to fraction form
    240,408/428,328 = 428,328/x
  3. Step 3: Cross multiply
    240,408x = 428,328 × 428,328
  4. Step 4: Simplify right side
    240,408x = 183,464,875,584
  5. Step 5: Solve for x
    x = 183,464,875,584/240,408
  6. Step 6: Final answer
    x = 763,139.64

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.