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Finding the Fourth Proportional to 288.67, 398.31 and 190.60

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Solution

The fourth proportional to 288.67, 398.31 and 190.60 is: 262.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.67 : 398.31 = 190.60 : x
  2. Step 2: Convert to fraction form
    288.67/398.31 = 190.60/x
  3. Step 3: Cross multiply
    288.67x = 398.31 × 190.60
  4. Step 4: Simplify right side
    288.67x = 75,917.89
  5. Step 5: Solve for x
    x = 75,917.89/288.67
  6. Step 6: Final answer
    x = 262.99

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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.