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Finding the Third Proportional to 212.91 and 368.81

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Solution

The third proportional to 212.91 and 368.81 is: 638.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.91 : 368.81 = 368.81 : x
  2. Step 2: Convert to fraction form
    212.91/368.81 = 368.81/x
  3. Step 3: Cross multiply
    212.91x = 368.81 × 368.81
  4. Step 4: Simplify right side
    212.91x = 136,022.66
  5. Step 5: Solve for x
    x = 136,022.66/212.91
  6. Step 6: Final answer
    x = 638.89

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Why These Related Problems?

These problems maintain the same ratio (1.73) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.