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Finding the Fourth Proportional to 118.21, 177.49 and 108.64

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Solution

The fourth proportional to 118.21, 177.49 and 108.64 is: 163.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 177.49 = 108.64 : x
  2. Step 2: Convert to fraction form
    118.21/177.49 = 108.64/x
  3. Step 3: Cross multiply
    118.21x = 177.49 × 108.64
  4. Step 4: Simplify right side
    118.21x = 19,282.51
  5. Step 5: Solve for x
    x = 19,282.51/118.21
  6. Step 6: Final answer
    x = 163.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.