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Finding the Fourth Proportional to 98.03, 146.92 and 85.81

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Solution

The fourth proportional to 98.03, 146.92 and 85.81 is: 128.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.03 : 146.92 = 85.81 : x
  2. Step 2: Convert to fraction form
    98.03/146.92 = 85.81/x
  3. Step 3: Cross multiply
    98.03x = 146.92 × 85.81
  4. Step 4: Simplify right side
    98.03x = 12,606.78
  5. Step 5: Solve for x
    x = 12,606.78/98.03
  6. Step 6: Final answer
    x = 128.61

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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.