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Finding the Fourth Proportional to 118.72, 177.98 and 57.78

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Solution

The fourth proportional to 118.72, 177.98 and 57.78 is: 86.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.72 : 177.98 = 57.78 : x
  2. Step 2: Convert to fraction form
    118.72/177.98 = 57.78/x
  3. Step 3: Cross multiply
    118.72x = 177.98 × 57.78
  4. Step 4: Simplify right side
    118.72x = 10,283.68
  5. Step 5: Solve for x
    x = 10,283.68/118.72
  6. Step 6: Final answer
    x = 86.62

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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.