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Finding the Third Proportional to 290.81 and 439.88

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Solution

The third proportional to 290.81 and 439.88 is: 665.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.81 : 439.88 = 439.88 : x
  2. Step 2: Convert to fraction form
    290.81/439.88 = 439.88/x
  3. Step 3: Cross multiply
    290.81x = 439.88 × 439.88
  4. Step 4: Simplify right side
    290.81x = 193,490.02
  5. Step 5: Solve for x
    x = 193,490.02/290.81
  6. Step 6: Final answer
    x = 665.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.