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Finding the Fourth Proportional to 118.85, 164.06 and 77.39

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Solution

The fourth proportional to 118.85, 164.06 and 77.39 is: 106.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.85 : 164.06 = 77.39 : x
  2. Step 2: Convert to fraction form
    118.85/164.06 = 77.39/x
  3. Step 3: Cross multiply
    118.85x = 164.06 × 77.39
  4. Step 4: Simplify right side
    118.85x = 12,696.30
  5. Step 5: Solve for x
    x = 12,696.30/118.85
  6. Step 6: Final answer
    x = 106.83

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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.