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Finding the Fourth Proportional to 288.91, 398.72 and 178.34

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Solution

The fourth proportional to 288.91, 398.72 and 178.34 is: 246.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.91 : 398.72 = 178.34 : x
  2. Step 2: Convert to fraction form
    288.91/398.72 = 178.34/x
  3. Step 3: Cross multiply
    288.91x = 398.72 × 178.34
  4. Step 4: Simplify right side
    288.91x = 71,107.72
  5. Step 5: Solve for x
    x = 71,107.72/288.91
  6. Step 6: Final answer
    x = 246.12

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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.