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Finding the Fourth Proportional to 248.15, 372.20 and 85.82

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Solution

The fourth proportional to 248.15, 372.20 and 85.82 is: 128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.15 : 372.20 = 85.82 : x
  2. Step 2: Convert to fraction form
    248.15/372.20 = 85.82/x
  3. Step 3: Cross multiply
    248.15x = 372.20 × 85.82
  4. Step 4: Simplify right side
    248.15x = 31,939.91
  5. Step 5: Solve for x
    x = 31,939.91/248.15
  6. Step 6: Final answer
    x = 128.71

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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.