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Finding the Third Proportional to 331.63 and 487.19

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Solution

The third proportional to 331.63 and 487.19 is: 715.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.63 : 487.19 = 487.19 : x
  2. Step 2: Convert to fraction form
    331.63/487.19 = 487.19/x
  3. Step 3: Cross multiply
    331.63x = 487.19 × 487.19
  4. Step 4: Simplify right side
    331.63x = 237,351.66
  5. Step 5: Solve for x
    x = 237,351.66/331.63
  6. Step 6: Final answer
    x = 715.72

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.