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Finding the Third Proportional to 421 and 490.75

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Solution

The third proportional to 421 and 490.75 is: 572.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 490.75 = 490.75 : x
  2. Step 2: Convert to fraction form
    421/490.75 = 490.75/x
  3. Step 3: Cross multiply
    421x = 490.75 × 490.75
  4. Step 4: Simplify right side
    421x = 240,835.56
  5. Step 5: Solve for x
    x = 240,835.56/421
  6. Step 6: Final answer
    x = 572.06

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.