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Finding the Fourth Proportional to 189.63, 261.74 and 115.94

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Solution

The fourth proportional to 189.63, 261.74 and 115.94 is: 160.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.63 : 261.74 = 115.94 : x
  2. Step 2: Convert to fraction form
    189.63/261.74 = 115.94/x
  3. Step 3: Cross multiply
    189.63x = 261.74 × 115.94
  4. Step 4: Simplify right side
    189.63x = 30,344.25
  5. Step 5: Solve for x
    x = 30,344.25/189.63
  6. Step 6: Final answer
    x = 160.02

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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.