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Finding the Fourth Proportional to 288.75, 398.08 and 190.34

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Solution

The fourth proportional to 288.75, 398.08 and 190.34 is: 262.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.75 : 398.08 = 190.34 : x
  2. Step 2: Convert to fraction form
    288.75/398.08 = 190.34/x
  3. Step 3: Cross multiply
    288.75x = 398.08 × 190.34
  4. Step 4: Simplify right side
    288.75x = 75,770.55
  5. Step 5: Solve for x
    x = 75,770.55/288.75
  6. Step 6: Final answer
    x = 262.41

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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.