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Finding the Third Proportional to 139 and 328.25

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Solution

The third proportional to 139 and 328.25 is: 775.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139 : 328.25 = 328.25 : x
  2. Step 2: Convert to fraction form
    139/328.25 = 328.25/x
  3. Step 3: Cross multiply
    139x = 328.25 × 328.25
  4. Step 4: Simplify right side
    139x = 107,748.06
  5. Step 5: Solve for x
    x = 107,748.06/139
  6. Step 6: Final answer
    x = 775.17

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.