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Finding the Third Proportional to 315 and 395.63

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Solution

The third proportional to 315 and 395.63 is: 496.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    315 : 395.63 = 395.63 : x
  2. Step 2: Convert to fraction form
    315/395.63 = 395.63/x
  3. Step 3: Cross multiply
    315x = 395.63 × 395.63
  4. Step 4: Simplify right side
    315x = 156,519.14
  5. Step 5: Solve for x
    x = 156,519.14/315
  6. Step 6: Final answer
    x = 496.89

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Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.