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Finding the Third Proportional to 239 and 313

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Solution

The third proportional to 239 and 313 is: 409.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    239 : 313 = 313 : x
  2. Step 2: Convert to fraction form
    239/313 = 313/x
  3. Step 3: Cross multiply
    239x = 313 × 313
  4. Step 4: Simplify right side
    239x = 97,969
  5. Step 5: Solve for x
    x = 97,969/239
  6. Step 6: Final answer
    x = 409.91

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.