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Finding the Third Proportional to 313.88 and 487.69

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Solution

The third proportional to 313.88 and 487.69 is: 757.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.88 : 487.69 = 487.69 : x
  2. Step 2: Convert to fraction form
    313.88/487.69 = 487.69/x
  3. Step 3: Cross multiply
    313.88x = 487.69 × 487.69
  4. Step 4: Simplify right side
    313.88x = 237,839.10
  5. Step 5: Solve for x
    x = 237,839.10/313.88
  6. Step 6: Final answer
    x = 757.75

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.