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Finding the Fourth Proportional to 71.99, 107.88 and 69.79

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Solution

The fourth proportional to 71.99, 107.88 and 69.79 is: 104.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.99 : 107.88 = 69.79 : x
  2. Step 2: Convert to fraction form
    71.99/107.88 = 69.79/x
  3. Step 3: Cross multiply
    71.99x = 107.88 × 69.79
  4. Step 4: Simplify right side
    71.99x = 7,528.95
  5. Step 5: Solve for x
    x = 7,528.95/71.99
  6. Step 6: Final answer
    x = 104.58

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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.