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Finding the Fourth Proportional to 118.81, 163.83 and 89.65

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Solution

The fourth proportional to 118.81, 163.83 and 89.65 is: 123.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.81 : 163.83 = 89.65 : x
  2. Step 2: Convert to fraction form
    118.81/163.83 = 89.65/x
  3. Step 3: Cross multiply
    118.81x = 163.83 × 89.65
  4. Step 4: Simplify right side
    118.81x = 14,687.36
  5. Step 5: Solve for x
    x = 14,687.36/118.81
  6. Step 6: Final answer
    x = 123.62

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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.