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Finding the Fourth Proportional to 248.19, 372.21 and 103.88

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Solution

The fourth proportional to 248.19, 372.21 and 103.88 is: 155.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.19 : 372.21 = 103.88 : x
  2. Step 2: Convert to fraction form
    248.19/372.21 = 103.88/x
  3. Step 3: Cross multiply
    248.19x = 372.21 × 103.88
  4. Step 4: Simplify right side
    248.19x = 38,663.31
  5. Step 5: Solve for x
    x = 38,663.31/248.19
  6. Step 6: Final answer
    x = 155.78

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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.