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Finding the Fourth Proportional to 378.87, 522.88 and 231.60

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Solution

The fourth proportional to 378.87, 522.88 and 231.60 is: 319.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.87 : 522.88 = 231.60 : x
  2. Step 2: Convert to fraction form
    378.87/522.88 = 231.60/x
  3. Step 3: Cross multiply
    378.87x = 522.88 × 231.60
  4. Step 4: Simplify right side
    378.87x = 121,098.43
  5. Step 5: Solve for x
    x = 121,098.43/378.87
  6. Step 6: Final answer
    x = 319.63

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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.