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Finding the Fourth Proportional to 251.20, 376.78 and 104.90

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Solution

The fourth proportional to 251.20, 376.78 and 104.90 is: 157.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.20 : 376.78 = 104.90 : x
  2. Step 2: Convert to fraction form
    251.20/376.78 = 104.90/x
  3. Step 3: Cross multiply
    251.20x = 376.78 × 104.90
  4. Step 4: Simplify right side
    251.20x = 39,521.98
  5. Step 5: Solve for x
    x = 39,521.98/251.20
  6. Step 6: Final answer
    x = 157.33

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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.