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Finding the Fourth Proportional to 189.09, 260.89 and 115.33

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Solution

The fourth proportional to 189.09, 260.89 and 115.33 is: 159.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.09 : 260.89 = 115.33 : x
  2. Step 2: Convert to fraction form
    189.09/260.89 = 115.33/x
  3. Step 3: Cross multiply
    189.09x = 260.89 × 115.33
  4. Step 4: Simplify right side
    189.09x = 30,087.99
  5. Step 5: Solve for x
    x = 30,087.99/189.09
  6. Step 6: Final answer
    x = 159.12

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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.