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Finding the Fourth Proportional to 248.21, 372.39 and 74.88

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Solution

The fourth proportional to 248.21, 372.39 and 74.88 is: 112.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.21 : 372.39 = 74.88 : x
  2. Step 2: Convert to fraction form
    248.21/372.39 = 74.88/x
  3. Step 3: Cross multiply
    248.21x = 372.39 × 74.88
  4. Step 4: Simplify right side
    248.21x = 27,884.49
  5. Step 5: Solve for x
    x = 27,884.49/248.21
  6. Step 6: Final answer
    x = 112.34

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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.