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Finding the Fourth Proportional to 251.28, 376.67 and 142.85

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Solution

The fourth proportional to 251.28, 376.67 and 142.85 is: 214.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 376.67 = 142.85 : x
  2. Step 2: Convert to fraction form
    251.28/376.67 = 142.85/x
  3. Step 3: Cross multiply
    251.28x = 376.67 × 142.85
  4. Step 4: Simplify right side
    251.28x = 53,804.71
  5. Step 5: Solve for x
    x = 53,804.71/251.28
  6. Step 6: Final answer
    x = 214.12

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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.