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Finding the Fourth Proportional to 251.28, 346.78 and 147.78

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Solution

The fourth proportional to 251.28, 346.78 and 147.78 is: 203.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.28 : 346.78 = 147.78 : x
  2. Step 2: Convert to fraction form
    251.28/346.78 = 147.78/x
  3. Step 3: Cross multiply
    251.28x = 346.78 × 147.78
  4. Step 4: Simplify right side
    251.28x = 51,247.15
  5. Step 5: Solve for x
    x = 51,247.15/251.28
  6. Step 6: Final answer
    x = 203.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.