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Finding the Fourth Proportional to 118.91, 164.09 and 89.75

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Solution

The fourth proportional to 118.91, 164.09 and 89.75 is: 123.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.91 : 164.09 = 89.75 : x
  2. Step 2: Convert to fraction form
    118.91/164.09 = 89.75/x
  3. Step 3: Cross multiply
    118.91x = 164.09 × 89.75
  4. Step 4: Simplify right side
    118.91x = 14,727.71
  5. Step 5: Solve for x
    x = 14,727.71/118.91
  6. Step 6: Final answer
    x = 123.85

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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.