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Finding the Fourth Proportional to 77.53, 107.03 and 49.92

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Solution

The fourth proportional to 77.53, 107.03 and 49.92 is: 68.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.53 : 107.03 = 49.92 : x
  2. Step 2: Convert to fraction form
    77.53/107.03 = 49.92/x
  3. Step 3: Cross multiply
    77.53x = 107.03 × 49.92
  4. Step 4: Simplify right side
    77.53x = 5,342.94
  5. Step 5: Solve for x
    x = 5,342.94/77.53
  6. Step 6: Final answer
    x = 68.91

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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.