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Finding the Third Proportional to 72,128 and 156,721

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Solution

The third proportional to 72,128 and 156,721 is: 340,526.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,128 : 156,721 = 156,721 : x
  2. Step 2: Convert to fraction form
    72,128/156,721 = 156,721/x
  3. Step 3: Cross multiply
    72,128x = 156,721 × 156,721
  4. Step 4: Simplify right side
    72,128x = 24,561,471,841
  5. Step 5: Solve for x
    x = 24,561,471,841/72,128
  6. Step 6: Final answer
    x = 340,526.17

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.