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Finding the Fourth Proportional to 76.54, 105.69 and 68.76

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Solution

The fourth proportional to 76.54, 105.69 and 68.76 is: 94.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.54 : 105.69 = 68.76 : x
  2. Step 2: Convert to fraction form
    76.54/105.69 = 68.76/x
  3. Step 3: Cross multiply
    76.54x = 105.69 × 68.76
  4. Step 4: Simplify right side
    76.54x = 7,267.24
  5. Step 5: Solve for x
    x = 7,267.24/76.54
  6. Step 6: Final answer
    x = 94.95

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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.