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Finding the Fourth Proportional to 189.45, 261.02 and 158.20

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Solution

The fourth proportional to 189.45, 261.02 and 158.20 is: 217.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.45 : 261.02 = 158.20 : x
  2. Step 2: Convert to fraction form
    189.45/261.02 = 158.20/x
  3. Step 3: Cross multiply
    189.45x = 261.02 × 158.20
  4. Step 4: Simplify right side
    189.45x = 41,293.11
  5. Step 5: Solve for x
    x = 41,293.11/189.45
  6. Step 6: Final answer
    x = 217.96

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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.