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Finding the Fourth Proportional to 103.82, 143.45 and 85.38

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Solution

The fourth proportional to 103.82, 143.45 and 85.38 is: 117.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.82 : 143.45 = 85.38 : x
  2. Step 2: Convert to fraction form
    103.82/143.45 = 85.38/x
  3. Step 3: Cross multiply
    103.82x = 143.45 × 85.38
  4. Step 4: Simplify right side
    103.82x = 12,247.33
  5. Step 5: Solve for x
    x = 12,247.33/103.82
  6. Step 6: Final answer
    x = 117.97

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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.