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Finding the Fourth Proportional to 77.07, 106.09 and 67.35

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Solution

The fourth proportional to 77.07, 106.09 and 67.35 is: 92.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.07 : 106.09 = 67.35 : x
  2. Step 2: Convert to fraction form
    77.07/106.09 = 67.35/x
  3. Step 3: Cross multiply
    77.07x = 106.09 × 67.35
  4. Step 4: Simplify right side
    77.07x = 7,145.16
  5. Step 5: Solve for x
    x = 7,145.16/77.07
  6. Step 6: Final answer
    x = 92.71

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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.