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Finding the Fourth Proportional to 69.98, 104.86 and 39.50

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Solution

The fourth proportional to 69.98, 104.86 and 39.50 is: 59.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.98 : 104.86 = 39.50 : x
  2. Step 2: Convert to fraction form
    69.98/104.86 = 39.50/x
  3. Step 3: Cross multiply
    69.98x = 104.86 × 39.50
  4. Step 4: Simplify right side
    69.98x = 4,141.97
  5. Step 5: Solve for x
    x = 4,141.97/69.98
  6. Step 6: Final answer
    x = 59.19

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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.