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Finding the Fourth Proportional to 189.11, 260.81 and 119.15

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Solution

The fourth proportional to 189.11, 260.81 and 119.15 is: 164.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.11 : 260.81 = 119.15 : x
  2. Step 2: Convert to fraction form
    189.11/260.81 = 119.15/x
  3. Step 3: Cross multiply
    189.11x = 260.81 × 119.15
  4. Step 4: Simplify right side
    189.11x = 31,075.57
  5. Step 5: Solve for x
    x = 31,075.57/189.11
  6. Step 6: Final answer
    x = 164.32

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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.