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Finding the Fourth Proportional to 251.11, 346.30 and 157.75

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Solution

The fourth proportional to 251.11, 346.30 and 157.75 is: 217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.11 : 346.30 = 157.75 : x
  2. Step 2: Convert to fraction form
    251.11/346.30 = 157.75/x
  3. Step 3: Cross multiply
    251.11x = 346.30 × 157.75
  4. Step 4: Simplify right side
    251.11x = 54,628.83
  5. Step 5: Solve for x
    x = 54,628.83/251.11
  6. Step 6: Final answer
    x = 217.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.