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Finding the Third Proportional to 218.81 and 291.94

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Solution

The third proportional to 218.81 and 291.94 is: 389.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.81 : 291.94 = 291.94 : x
  2. Step 2: Convert to fraction form
    218.81/291.94 = 291.94/x
  3. Step 3: Cross multiply
    218.81x = 291.94 × 291.94
  4. Step 4: Simplify right side
    218.81x = 85,227.50
  5. Step 5: Solve for x
    x = 85,227.50/218.81
  6. Step 6: Final answer
    x = 389.50

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.