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Finding the Fourth Proportional to 78.94, 118.20 and 61.73

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Solution

The fourth proportional to 78.94, 118.20 and 61.73 is: 92.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.94 : 118.20 = 61.73 : x
  2. Step 2: Convert to fraction form
    78.94/118.20 = 61.73/x
  3. Step 3: Cross multiply
    78.94x = 118.20 × 61.73
  4. Step 4: Simplify right side
    78.94x = 7,296.49
  5. Step 5: Solve for x
    x = 7,296.49/78.94
  6. Step 6: Final answer
    x = 92.43

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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.