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Finding the Fourth Proportional to 104.78, 144.41 and 85.34

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Solution

The fourth proportional to 104.78, 144.41 and 85.34 is: 117.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.78 : 144.41 = 85.34 : x
  2. Step 2: Convert to fraction form
    104.78/144.41 = 85.34/x
  3. Step 3: Cross multiply
    104.78x = 144.41 × 85.34
  4. Step 4: Simplify right side
    104.78x = 12,323.95
  5. Step 5: Solve for x
    x = 12,323.95/104.78
  6. Step 6: Final answer
    x = 117.62

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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.