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Finding the Fourth Proportional to 76.54, 105.60 and 70.96

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Solution

The fourth proportional to 76.54, 105.60 and 70.96 is: 97.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.54 : 105.60 = 70.96 : x
  2. Step 2: Convert to fraction form
    76.54/105.60 = 70.96/x
  3. Step 3: Cross multiply
    76.54x = 105.60 × 70.96
  4. Step 4: Simplify right side
    76.54x = 7,493.38
  5. Step 5: Solve for x
    x = 7,493.38/76.54
  6. Step 6: Final answer
    x = 97.90

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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.