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Finding the Fourth Proportional to 248.81, 372.40 and 221.81

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Solution

The fourth proportional to 248.81, 372.40 and 221.81 is: 331.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.81 : 372.40 = 221.81 : x
  2. Step 2: Convert to fraction form
    248.81/372.40 = 221.81/x
  3. Step 3: Cross multiply
    248.81x = 372.40 × 221.81
  4. Step 4: Simplify right side
    248.81x = 82,599.63
  5. Step 5: Solve for x
    x = 82,599.63/248.81
  6. Step 6: Final answer
    x = 331.99

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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.