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Finding the Third Proportional to 208.31 and 320.63

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Solution

The third proportional to 208.31 and 320.63 is: 493.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.31 : 320.63 = 320.63 : x
  2. Step 2: Convert to fraction form
    208.31/320.63 = 320.63/x
  3. Step 3: Cross multiply
    208.31x = 320.63 × 320.63
  4. Step 4: Simplify right side
    208.31x = 102,800.39
  5. Step 5: Solve for x
    x = 102,800.39/208.31
  6. Step 6: Final answer
    x = 493.49

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.