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Finding the Fourth Proportional to 77.64, 107.12 and 49.98

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Solution

The fourth proportional to 77.64, 107.12 and 49.98 is: 68.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.64 : 107.12 = 49.98 : x
  2. Step 2: Convert to fraction form
    77.64/107.12 = 49.98/x
  3. Step 3: Cross multiply
    77.64x = 107.12 × 49.98
  4. Step 4: Simplify right side
    77.64x = 5,353.55
  5. Step 5: Solve for x
    x = 5,353.55/77.64
  6. Step 6: Final answer
    x = 68.95

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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.