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Finding the Fourth Proportional to 118.50, 177.80 and 60.75

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Solution

The fourth proportional to 118.50, 177.80 and 60.75 is: 91.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.50 : 177.80 = 60.75 : x
  2. Step 2: Convert to fraction form
    118.50/177.80 = 60.75/x
  3. Step 3: Cross multiply
    118.50x = 177.80 × 60.75
  4. Step 4: Simplify right side
    118.50x = 10,801.05
  5. Step 5: Solve for x
    x = 10,801.05/118.50
  6. Step 6: Final answer
    x = 91.15

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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.