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Finding the Fourth Proportional to 77.19, 115.78 and 34.44

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Solution

The fourth proportional to 77.19, 115.78 and 34.44 is: 51.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.19 : 115.78 = 34.44 : x
  2. Step 2: Convert to fraction form
    77.19/115.78 = 34.44/x
  3. Step 3: Cross multiply
    77.19x = 115.78 × 34.44
  4. Step 4: Simplify right side
    77.19x = 3,987.46
  5. Step 5: Solve for x
    x = 3,987.46/77.19
  6. Step 6: Final answer
    x = 51.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.