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Finding the Fourth Proportional to 189.93, 261.95 and 115.24

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Solution

The fourth proportional to 189.93, 261.95 and 115.24 is: 158.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.93 : 261.95 = 115.24 : x
  2. Step 2: Convert to fraction form
    189.93/261.95 = 115.24/x
  3. Step 3: Cross multiply
    189.93x = 261.95 × 115.24
  4. Step 4: Simplify right side
    189.93x = 30,187.12
  5. Step 5: Solve for x
    x = 30,187.12/189.93
  6. Step 6: Final answer
    x = 158.94

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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.