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Finding the Third Proportional to 272.75 and 389.50

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Solution

The third proportional to 272.75 and 389.50 is: 556.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.75 : 389.50 = 389.50 : x
  2. Step 2: Convert to fraction form
    272.75/389.50 = 389.50/x
  3. Step 3: Cross multiply
    272.75x = 389.50 × 389.50
  4. Step 4: Simplify right side
    272.75x = 151,710.25
  5. Step 5: Solve for x
    x = 151,710.25/272.75
  6. Step 6: Final answer
    x = 556.22

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.