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Finding the Fourth Proportional to 118.73, 178.16 and 53.77

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Solution

The fourth proportional to 118.73, 178.16 and 53.77 is: 80.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.73 : 178.16 = 53.77 : x
  2. Step 2: Convert to fraction form
    118.73/178.16 = 53.77/x
  3. Step 3: Cross multiply
    118.73x = 178.16 × 53.77
  4. Step 4: Simplify right side
    118.73x = 9,578.95
  5. Step 5: Solve for x
    x = 9,578.95/118.73
  6. Step 6: Final answer
    x = 80.68

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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.