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Finding the Third Proportional to 138,120 and 305,280

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Solution

The third proportional to 138,120 and 305,280 is: 674,745.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,120 : 305,280 = 305,280 : x
  2. Step 2: Convert to fraction form
    138,120/305,280 = 305,280/x
  3. Step 3: Cross multiply
    138,120x = 305,280 × 305,280
  4. Step 4: Simplify right side
    138,120x = 93,195,878,400
  5. Step 5: Solve for x
    x = 93,195,878,400/138,120
  6. Step 6: Final answer
    x = 674,745.72

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.