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Finding the Third Proportional to 420.75 and 544.50

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Solution

The third proportional to 420.75 and 544.50 is: 704.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.75 : 544.50 = 544.50 : x
  2. Step 2: Convert to fraction form
    420.75/544.50 = 544.50/x
  3. Step 3: Cross multiply
    420.75x = 544.50 × 544.50
  4. Step 4: Simplify right side
    420.75x = 296,480.25
  5. Step 5: Solve for x
    x = 296,480.25/420.75
  6. Step 6: Final answer
    x = 704.65

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.