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Finding the Third Proportional to 317.16 and 490.15

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Solution

The third proportional to 317.16 and 490.15 is: 757.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.16 : 490.15 = 490.15 : x
  2. Step 2: Convert to fraction form
    317.16/490.15 = 490.15/x
  3. Step 3: Cross multiply
    317.16x = 490.15 × 490.15
  4. Step 4: Simplify right side
    317.16x = 240,249.80
  5. Step 5: Solve for x
    x = 240,249.80/317.16
  6. Step 6: Final answer
    x = 757.51

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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.