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Finding the Fourth Proportional to 288.87, 398.72 and 178.31

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Solution

The fourth proportional to 288.87, 398.72 and 178.31 is: 246.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.87 : 398.72 = 178.31 : x
  2. Step 2: Convert to fraction form
    288.87/398.72 = 178.31/x
  3. Step 3: Cross multiply
    288.87x = 398.72 × 178.31
  4. Step 4: Simplify right side
    288.87x = 71,092.88
  5. Step 5: Solve for x
    x = 71,092.88/288.87
  6. Step 6: Final answer
    x = 246.11

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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.