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Finding the Third Proportional to 318.25 and 492.38

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Solution

The third proportional to 318.25 and 492.38 is: 761.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.25 : 492.38 = 492.38 : x
  2. Step 2: Convert to fraction form
    318.25/492.38 = 492.38/x
  3. Step 3: Cross multiply
    318.25x = 492.38 × 492.38
  4. Step 4: Simplify right side
    318.25x = 242,433.14
  5. Step 5: Solve for x
    x = 242,433.14/318.25
  6. Step 6: Final answer
    x = 761.77

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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.