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Finding the Third Proportional to 267,408 and 393,120

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Solution

The third proportional to 267,408 and 393,120 is: 577,930.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    267,408 : 393,120 = 393,120 : x
  2. Step 2: Convert to fraction form
    267,408/393,120 = 393,120/x
  3. Step 3: Cross multiply
    267,408x = 393,120 × 393,120
  4. Step 4: Simplify right side
    267,408x = 154,543,334,400
  5. Step 5: Solve for x
    x = 154,543,334,400/267,408
  6. Step 6: Final answer
    x = 577,930.86

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.