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Finding the Third Proportional to 320.63 and 490.19

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Solution

The third proportional to 320.63 and 490.19 is: 749.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.63 : 490.19 = 490.19 : x
  2. Step 2: Convert to fraction form
    320.63/490.19 = 490.19/x
  3. Step 3: Cross multiply
    320.63x = 490.19 × 490.19
  4. Step 4: Simplify right side
    320.63x = 240,283.79
  5. Step 5: Solve for x
    x = 240,283.79/320.63
  6. Step 6: Final answer
    x = 749.42

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.