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Finding the Third Proportional to 251.75 and 389.06

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Solution

The third proportional to 251.75 and 389.06 is: 601.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.75 : 389.06 = 389.06 : x
  2. Step 2: Convert to fraction form
    251.75/389.06 = 389.06/x
  3. Step 3: Cross multiply
    251.75x = 389.06 × 389.06
  4. Step 4: Simplify right side
    251.75x = 151,369.63
  5. Step 5: Solve for x
    x = 151,369.63/251.75
  6. Step 6: Final answer
    x = 601.27

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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.