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Finding the Fourth Proportional to 102.58, 141.44 and 83.85

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Solution

The fourth proportional to 102.58, 141.44 and 83.85 is: 115.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.58 : 141.44 = 83.85 : x
  2. Step 2: Convert to fraction form
    102.58/141.44 = 83.85/x
  3. Step 3: Cross multiply
    102.58x = 141.44 × 83.85
  4. Step 4: Simplify right side
    102.58x = 11,859.04
  5. Step 5: Solve for x
    x = 11,859.04/102.58
  6. Step 6: Final answer
    x = 115.61

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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.