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Finding the Fourth Proportional to 69.60, 104.21 and 39.05

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Solution

The fourth proportional to 69.60, 104.21 and 39.05 is: 58.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.60 : 104.21 = 39.05 : x
  2. Step 2: Convert to fraction form
    69.60/104.21 = 39.05/x
  3. Step 3: Cross multiply
    69.60x = 104.21 × 39.05
  4. Step 4: Simplify right side
    69.60x = 4,069.47
  5. Step 5: Solve for x
    x = 4,069.47/69.60
  6. Step 6: Final answer
    x = 58.47

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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.