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Finding the Fourth Proportional to 248.15, 372.12 and 85.79

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Solution

The fourth proportional to 248.15, 372.12 and 85.79 is: 128.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.15 : 372.12 = 85.79 : x
  2. Step 2: Convert to fraction form
    248.15/372.12 = 85.79/x
  3. Step 3: Cross multiply
    248.15x = 372.12 × 85.79
  4. Step 4: Simplify right side
    248.15x = 31,922.31
  5. Step 5: Solve for x
    x = 31,922.31/248.15
  6. Step 6: Final answer
    x = 128.64

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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.