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Finding the Fourth Proportional to 243.33, 365.31 and 212.91

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Solution

The fourth proportional to 243.33, 365.31 and 212.91 is: 319.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.33 : 365.31 = 212.91 : x
  2. Step 2: Convert to fraction form
    243.33/365.31 = 212.91/x
  3. Step 3: Cross multiply
    243.33x = 365.31 × 212.91
  4. Step 4: Simplify right side
    243.33x = 77,778.15
  5. Step 5: Solve for x
    x = 77,778.15/243.33
  6. Step 6: Final answer
    x = 319.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.