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Finding the Fourth Proportional to 339.80, 468.12 and 281.48

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Solution

The fourth proportional to 339.80, 468.12 and 281.48 is: 387.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.80 : 468.12 = 281.48 : x
  2. Step 2: Convert to fraction form
    339.80/468.12 = 281.48/x
  3. Step 3: Cross multiply
    339.80x = 468.12 × 281.48
  4. Step 4: Simplify right side
    339.80x = 131,766.42
  5. Step 5: Solve for x
    x = 131,766.42/339.80
  6. Step 6: Final answer
    x = 387.78

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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.