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Finding the Fourth Proportional to 288.97, 398.72 and 190.55

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Solution

The fourth proportional to 288.97, 398.72 and 190.55 is: 262.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.97 : 398.72 = 190.55 : x
  2. Step 2: Convert to fraction form
    288.97/398.72 = 190.55/x
  3. Step 3: Cross multiply
    288.97x = 398.72 × 190.55
  4. Step 4: Simplify right side
    288.97x = 75,977.57
  5. Step 5: Solve for x
    x = 75,977.57/288.97
  6. Step 6: Final answer
    x = 262.93

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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.