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Finding the Fourth Proportional to 189.78, 261.27 and 165.12

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Solution

The fourth proportional to 189.78, 261.27 and 165.12 is: 227.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.78 : 261.27 = 165.12 : x
  2. Step 2: Convert to fraction form
    189.78/261.27 = 165.12/x
  3. Step 3: Cross multiply
    189.78x = 261.27 × 165.12
  4. Step 4: Simplify right side
    189.78x = 43,140.90
  5. Step 5: Solve for x
    x = 43,140.90/189.78
  6. Step 6: Final answer
    x = 227.32

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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.