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Finding the Third Proportional to 153.77 and 321.79

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Solution

The third proportional to 153.77 and 321.79 is: 673.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.77 : 321.79 = 321.79 : x
  2. Step 2: Convert to fraction form
    153.77/321.79 = 321.79/x
  3. Step 3: Cross multiply
    153.77x = 321.79 × 321.79
  4. Step 4: Simplify right side
    153.77x = 103,545.69
  5. Step 5: Solve for x
    x = 103,545.69/153.77
  6. Step 6: Final answer
    x = 673.37

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.