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Finding the Fourth Proportional to 251.28, 376.64 and 129.46

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Solution

The fourth proportional to 251.28, 376.64 and 129.46 is: 194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 376.64 = 129.46 : x
  2. Step 2: Convert to fraction form
    251.28/376.64 = 129.46/x
  3. Step 3: Cross multiply
    251.28x = 376.64 × 129.46
  4. Step 4: Simplify right side
    251.28x = 48,759.81
  5. Step 5: Solve for x
    x = 48,759.81/251.28
  6. Step 6: Final answer
    x = 194.05

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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.