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Finding the Fourth Proportional to 77.82, 107.39 and 43.32

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Solution

The fourth proportional to 77.82, 107.39 and 43.32 is: 59.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.82 : 107.39 = 43.32 : x
  2. Step 2: Convert to fraction form
    77.82/107.39 = 43.32/x
  3. Step 3: Cross multiply
    77.82x = 107.39 × 43.32
  4. Step 4: Simplify right side
    77.82x = 4,651.38
  5. Step 5: Solve for x
    x = 4,651.38/77.82
  6. Step 6: Final answer
    x = 59.77

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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.