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Finding the Fourth Proportional to 78.37, 108.05 and 65.97

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Solution

The fourth proportional to 78.37, 108.05 and 65.97 is: 90.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.37 : 108.05 = 65.97 : x
  2. Step 2: Convert to fraction form
    78.37/108.05 = 65.97/x
  3. Step 3: Cross multiply
    78.37x = 108.05 × 65.97
  4. Step 4: Simplify right side
    78.37x = 7,127.73
  5. Step 5: Solve for x
    x = 7,127.73/78.37
  6. Step 6: Final answer
    x = 90.95

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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.