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Finding the Third Proportional to 392.50 and 553.50

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Solution

The third proportional to 392.50 and 553.50 is: 780.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.50 : 553.50 = 553.50 : x
  2. Step 2: Convert to fraction form
    392.50/553.50 = 553.50/x
  3. Step 3: Cross multiply
    392.50x = 553.50 × 553.50
  4. Step 4: Simplify right side
    392.50x = 306,362.25
  5. Step 5: Solve for x
    x = 306,362.25/392.50
  6. Step 6: Final answer
    x = 780.54

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.