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Finding the Fourth Proportional to 461.82, 636.42 and 378.66

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Solution

The fourth proportional to 461.82, 636.42 and 378.66 is: 521.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.82 : 636.42 = 378.66 : x
  2. Step 2: Convert to fraction form
    461.82/636.42 = 378.66/x
  3. Step 3: Cross multiply
    461.82x = 636.42 × 378.66
  4. Step 4: Simplify right side
    461.82x = 240,986.80
  5. Step 5: Solve for x
    x = 240,986.80/461.82
  6. Step 6: Final answer
    x = 521.82

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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.