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Finding the Fourth Proportional to 445.78, 615.20 and 249.31

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Solution

The fourth proportional to 445.78, 615.20 and 249.31 is: 344.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.78 : 615.20 = 249.31 : x
  2. Step 2: Convert to fraction form
    445.78/615.20 = 249.31/x
  3. Step 3: Cross multiply
    445.78x = 615.20 × 249.31
  4. Step 4: Simplify right side
    445.78x = 153,375.51
  5. Step 5: Solve for x
    x = 153,375.51/445.78
  6. Step 6: Final answer
    x = 344.06

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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.