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Finding the Third Proportional to 318.84 and 487.69

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Solution

The third proportional to 318.84 and 487.69 is: 745.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.84 : 487.69 = 487.69 : x
  2. Step 2: Convert to fraction form
    318.84/487.69 = 487.69/x
  3. Step 3: Cross multiply
    318.84x = 487.69 × 487.69
  4. Step 4: Simplify right side
    318.84x = 237,839.10
  5. Step 5: Solve for x
    x = 237,839.10/318.84
  6. Step 6: Final answer
    x = 745.94

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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.