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Finding the Third Proportional to 289.50 and 393

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Solution

The third proportional to 289.50 and 393 is: 533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.50 : 393 = 393 : x
  2. Step 2: Convert to fraction form
    289.50/393 = 393/x
  3. Step 3: Cross multiply
    289.50x = 393 × 393
  4. Step 4: Simplify right side
    289.50x = 154,449
  5. Step 5: Solve for x
    x = 154,449/289.50
  6. Step 6: Final answer
    x = 533.50

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.