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Finding the Fourth Proportional to 251.20, 346.35 and 211.71

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Solution

The fourth proportional to 251.20, 346.35 and 211.71 is: 291.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.20 : 346.35 = 211.71 : x
  2. Step 2: Convert to fraction form
    251.20/346.35 = 211.71/x
  3. Step 3: Cross multiply
    251.20x = 346.35 × 211.71
  4. Step 4: Simplify right side
    251.20x = 73,327.26
  5. Step 5: Solve for x
    x = 73,327.26/251.20
  6. Step 6: Final answer
    x = 291.91

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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.