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Finding the Fourth Proportional to 69.39, 95.79 and 55.62

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Solution

The fourth proportional to 69.39, 95.79 and 55.62 is: 76.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.39 : 95.79 = 55.62 : x
  2. Step 2: Convert to fraction form
    69.39/95.79 = 55.62/x
  3. Step 3: Cross multiply
    69.39x = 95.79 × 55.62
  4. Step 4: Simplify right side
    69.39x = 5,327.84
  5. Step 5: Solve for x
    x = 5,327.84/69.39
  6. Step 6: Final answer
    x = 76.78

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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.