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Finding the Fourth Proportional to 189.99, 262.28 and 120.09

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Solution

The fourth proportional to 189.99, 262.28 and 120.09 is: 165.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.99 : 262.28 = 120.09 : x
  2. Step 2: Convert to fraction form
    189.99/262.28 = 120.09/x
  3. Step 3: Cross multiply
    189.99x = 262.28 × 120.09
  4. Step 4: Simplify right side
    189.99x = 31,496.60
  5. Step 5: Solve for x
    x = 31,496.60/189.99
  6. Step 6: Final answer
    x = 165.78

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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.