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Finding the Third Proportional to 161.79 and 251.02

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Solution

The third proportional to 161.79 and 251.02 is: 389.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.79 : 251.02 = 251.02 : x
  2. Step 2: Convert to fraction form
    161.79/251.02 = 251.02/x
  3. Step 3: Cross multiply
    161.79x = 251.02 × 251.02
  4. Step 4: Simplify right side
    161.79x = 63,008.84
  5. Step 5: Solve for x
    x = 63,008.84/161.79
  6. Step 6: Final answer
    x = 389.45

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.