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Finding the Fourth Proportional to 288.76, 398.31 and 190.54

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Solution

The fourth proportional to 288.76, 398.31 and 190.54 is: 262.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.76 : 398.31 = 190.54 : x
  2. Step 2: Convert to fraction form
    288.76/398.31 = 190.54/x
  3. Step 3: Cross multiply
    288.76x = 398.31 × 190.54
  4. Step 4: Simplify right side
    288.76x = 75,893.99
  5. Step 5: Solve for x
    x = 75,893.99/288.76
  6. Step 6: Final answer
    x = 262.83

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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.