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Finding the Fourth Proportional to 378.89, 522.85 and 231.77

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Solution

The fourth proportional to 378.89, 522.85 and 231.77 is: 319.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.89 : 522.85 = 231.77 : x
  2. Step 2: Convert to fraction form
    378.89/522.85 = 231.77/x
  3. Step 3: Cross multiply
    378.89x = 522.85 × 231.77
  4. Step 4: Simplify right side
    378.89x = 121,180.94
  5. Step 5: Solve for x
    x = 121,180.94/378.89
  6. Step 6: Final answer
    x = 319.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.