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Finding the Fourth Proportional to 189, 260.61 and 129.98

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Solution

The fourth proportional to 189, 260.61 and 129.98 is: 179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    189 : 260.61 = 129.98 : x
  2. Step 2: Convert to fraction form
    189/260.61 = 129.98/x
  3. Step 3: Cross multiply
    189x = 260.61 × 129.98
  4. Step 4: Simplify right side
    189x = 33,872.78
  5. Step 5: Solve for x
    x = 33,872.78/189
  6. Step 6: Final answer
    x = 179.22

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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.