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Finding the Fourth Proportional to 69.63, 104.45 and 39.20

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Solution

The fourth proportional to 69.63, 104.45 and 39.20 is: 58.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.63 : 104.45 = 39.20 : x
  2. Step 2: Convert to fraction form
    69.63/104.45 = 39.20/x
  3. Step 3: Cross multiply
    69.63x = 104.45 × 39.20
  4. Step 4: Simplify right side
    69.63x = 4,094.44
  5. Step 5: Solve for x
    x = 4,094.44/69.63
  6. Step 6: Final answer
    x = 58.80

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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.