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Finding the Fourth Proportional to 106.39, 146.78 and 69.54

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Solution

The fourth proportional to 106.39, 146.78 and 69.54 is: 95.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.39 : 146.78 = 69.54 : x
  2. Step 2: Convert to fraction form
    106.39/146.78 = 69.54/x
  3. Step 3: Cross multiply
    106.39x = 146.78 × 69.54
  4. Step 4: Simplify right side
    106.39x = 10,207.08
  5. Step 5: Solve for x
    x = 10,207.08/106.39
  6. Step 6: Final answer
    x = 95.94

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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.