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Finding the Fourth Proportional to 77.56, 107.04 and 49.92

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Solution

The fourth proportional to 77.56, 107.04 and 49.92 is: 68.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.56 : 107.04 = 49.92 : x
  2. Step 2: Convert to fraction form
    77.56/107.04 = 49.92/x
  3. Step 3: Cross multiply
    77.56x = 107.04 × 49.92
  4. Step 4: Simplify right side
    77.56x = 5,343.22
  5. Step 5: Solve for x
    x = 5,343.22/77.56
  6. Step 6: Final answer
    x = 68.89

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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.