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Finding the Fourth Proportional to 251.08, 378.71 and 221.02

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Solution

The fourth proportional to 251.08, 378.71 and 221.02 is: 333.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.08 : 378.71 = 221.02 : x
  2. Step 2: Convert to fraction form
    251.08/378.71 = 221.02/x
  3. Step 3: Cross multiply
    251.08x = 378.71 × 221.02
  4. Step 4: Simplify right side
    251.08x = 83,702.48
  5. Step 5: Solve for x
    x = 83,702.48/251.08
  6. Step 6: Final answer
    x = 333.37

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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.