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Finding the Fourth Proportional to 77.63, 107.08 and 49.96

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Solution

The fourth proportional to 77.63, 107.08 and 49.96 is: 68.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.63 : 107.08 = 49.96 : x
  2. Step 2: Convert to fraction form
    77.63/107.08 = 49.96/x
  3. Step 3: Cross multiply
    77.63x = 107.08 × 49.96
  4. Step 4: Simplify right side
    77.63x = 5,349.32
  5. Step 5: Solve for x
    x = 5,349.32/77.63
  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.