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Finding the Fourth Proportional to 118.21, 177.32 and 66.82

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Solution

The fourth proportional to 118.21, 177.32 and 66.82 is: 100.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.21 : 177.32 = 66.82 : x
  2. Step 2: Convert to fraction form
    118.21/177.32 = 66.82/x
  3. Step 3: Cross multiply
    118.21x = 177.32 × 66.82
  4. Step 4: Simplify right side
    118.21x = 11,848.52
  5. Step 5: Solve for x
    x = 11,848.52/118.21
  6. Step 6: Final answer
    x = 100.23

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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.