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Finding the Third Proportional to 289.13 and 403.31

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Solution

The third proportional to 289.13 and 403.31 is: 562.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.13 : 403.31 = 403.31 : x
  2. Step 2: Convert to fraction form
    289.13/403.31 = 403.31/x
  3. Step 3: Cross multiply
    289.13x = 403.31 × 403.31
  4. Step 4: Simplify right side
    289.13x = 162,660.97
  5. Step 5: Solve for x
    x = 162,660.97/289.13
  6. Step 6: Final answer
    x = 562.60

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.