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Finding the Fourth Proportional to 118.49, 177.87 and 69.85

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Solution

The fourth proportional to 118.49, 177.87 and 69.85 is: 104.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.49 : 177.87 = 69.85 : x
  2. Step 2: Convert to fraction form
    118.49/177.87 = 69.85/x
  3. Step 3: Cross multiply
    118.49x = 177.87 × 69.85
  4. Step 4: Simplify right side
    118.49x = 12,423.33
  5. Step 5: Solve for x
    x = 12,423.33/118.49
  6. Step 6: Final answer
    x = 104.85

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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.