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Finding the Third Proportional to 64,422 and 90,720

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Solution

The third proportional to 64,422 and 90,720 is: 127,753.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,422 : 90,720 = 90,720 : x
  2. Step 2: Convert to fraction form
    64,422/90,720 = 90,720/x
  3. Step 3: Cross multiply
    64,422x = 90,720 × 90,720
  4. Step 4: Simplify right side
    64,422x = 8,230,118,400
  5. Step 5: Solve for x
    x = 8,230,118,400/64,422
  6. Step 6: Final answer
    x = 127,753.23

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.