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Finding the Fourth Proportional to 104.56, 144.42 and 85.30

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Solution

The fourth proportional to 104.56, 144.42 and 85.30 is: 117.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.56 : 144.42 = 85.30 : x
  2. Step 2: Convert to fraction form
    104.56/144.42 = 85.30/x
  3. Step 3: Cross multiply
    104.56x = 144.42 × 85.30
  4. Step 4: Simplify right side
    104.56x = 12,319.03
  5. Step 5: Solve for x
    x = 12,319.03/104.56
  6. Step 6: Final answer
    x = 117.82

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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.