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Finding the Fourth Proportional to 378.12, 566.66 and 326.55

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Solution

The fourth proportional to 378.12, 566.66 and 326.55 is: 489.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.12 : 566.66 = 326.55 : x
  2. Step 2: Convert to fraction form
    378.12/566.66 = 326.55/x
  3. Step 3: Cross multiply
    378.12x = 566.66 × 326.55
  4. Step 4: Simplify right side
    378.12x = 185,042.82
  5. Step 5: Solve for x
    x = 185,042.82/378.12
  6. Step 6: Final answer
    x = 489.38

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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.