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Finding the Fourth Proportional to 76.54, 105.56 and 61.79

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Solution

The fourth proportional to 76.54, 105.56 and 61.79 is: 85.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.54 : 105.56 = 61.79 : x
  2. Step 2: Convert to fraction form
    76.54/105.56 = 61.79/x
  3. Step 3: Cross multiply
    76.54x = 105.56 × 61.79
  4. Step 4: Simplify right side
    76.54x = 6,522.18
  5. Step 5: Solve for x
    x = 6,522.18/76.54
  6. Step 6: Final answer
    x = 85.21

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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.