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Finding the Fourth Proportional to 251.28, 376.78 and 104.86

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Solution

The fourth proportional to 251.28, 376.78 and 104.86 is: 157.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 376.78 = 104.86 : x
  2. Step 2: Convert to fraction form
    251.28/376.78 = 104.86/x
  3. Step 3: Cross multiply
    251.28x = 376.78 × 104.86
  4. Step 4: Simplify right side
    251.28x = 39,509.15
  5. Step 5: Solve for x
    x = 39,509.15/251.28
  6. Step 6: Final answer
    x = 157.23

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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.