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Finding the Fourth Proportional to 251.31, 376.90 and 80.31

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Solution

The fourth proportional to 251.31, 376.90 and 80.31 is: 120.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.31 : 376.90 = 80.31 : x
  2. Step 2: Convert to fraction form
    251.31/376.90 = 80.31/x
  3. Step 3: Cross multiply
    251.31x = 376.90 × 80.31
  4. Step 4: Simplify right side
    251.31x = 30,268.84
  5. Step 5: Solve for x
    x = 30,268.84/251.31
  6. Step 6: Final answer
    x = 120.44

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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.