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Finding the Fourth Proportional to 98.11, 146.81 and 70.69

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Solution

The fourth proportional to 98.11, 146.81 and 70.69 is: 105.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.11 : 146.81 = 70.69 : x
  2. Step 2: Convert to fraction form
    98.11/146.81 = 70.69/x
  3. Step 3: Cross multiply
    98.11x = 146.81 × 70.69
  4. Step 4: Simplify right side
    98.11x = 10,377.65
  5. Step 5: Solve for x
    x = 10,377.65/98.11
  6. Step 6: Final answer
    x = 105.78

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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.