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Finding the Fourth Proportional to 78.73, 108.39 and 63.94

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Solution

The fourth proportional to 78.73, 108.39 and 63.94 is: 88.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.73 : 108.39 = 63.94 : x
  2. Step 2: Convert to fraction form
    78.73/108.39 = 63.94/x
  3. Step 3: Cross multiply
    78.73x = 108.39 × 63.94
  4. Step 4: Simplify right side
    78.73x = 6,930.46
  5. Step 5: Solve for x
    x = 6,930.46/78.73
  6. Step 6: Final answer
    x = 88.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.