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Finding the Fourth Proportional to 97.32, 134.46 and 78.15

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Solution

The fourth proportional to 97.32, 134.46 and 78.15 is: 107.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.32 : 134.46 = 78.15 : x
  2. Step 2: Convert to fraction form
    97.32/134.46 = 78.15/x
  3. Step 3: Cross multiply
    97.32x = 134.46 × 78.15
  4. Step 4: Simplify right side
    97.32x = 10,508.05
  5. Step 5: Solve for x
    x = 10,508.05/97.32
  6. Step 6: Final answer
    x = 107.97

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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.