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Finding the Fourth Proportional to 251.15, 378.59 and 231.12

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Solution

The fourth proportional to 251.15, 378.59 and 231.12 is: 348.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.15 : 378.59 = 231.12 : x
  2. Step 2: Convert to fraction form
    251.15/378.59 = 231.12/x
  3. Step 3: Cross multiply
    251.15x = 378.59 × 231.12
  4. Step 4: Simplify right side
    251.15x = 87,498.57
  5. Step 5: Solve for x
    x = 87,498.57/251.15
  6. Step 6: Final answer
    x = 348.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.