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Finding the Fourth Proportional to 188.45, 260.21 and 118.61

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Solution

The fourth proportional to 188.45, 260.21 and 118.61 is: 163.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.45 : 260.21 = 118.61 : x
  2. Step 2: Convert to fraction form
    188.45/260.21 = 118.61/x
  3. Step 3: Cross multiply
    188.45x = 260.21 × 118.61
  4. Step 4: Simplify right side
    188.45x = 30,861.61
  5. Step 5: Solve for x
    x = 30,861.61/188.45
  6. Step 6: Final answer
    x = 163.77

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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.