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Finding the Third Proportional to 153.77 and 239.20

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Solution

The third proportional to 153.77 and 239.20 is: 372.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.77 : 239.20 = 239.20 : x
  2. Step 2: Convert to fraction form
    153.77/239.20 = 239.20/x
  3. Step 3: Cross multiply
    153.77x = 239.20 × 239.20
  4. Step 4: Simplify right side
    153.77x = 57,218.14
  5. Step 5: Solve for x
    x = 57,218.14/153.77
  6. Step 6: Final answer
    x = 372.09

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.