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Finding the Fourth Proportional to 71.94, 108 and 69.06

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Solution

The fourth proportional to 71.94, 108 and 69.06 is: 103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.94 : 108 = 69.06 : x
  2. Step 2: Convert to fraction form
    71.94/108 = 69.06/x
  3. Step 3: Cross multiply
    71.94x = 108 × 69.06
  4. Step 4: Simplify right side
    71.94x = 7,458.48
  5. Step 5: Solve for x
    x = 7,458.48/71.94
  6. Step 6: Final answer
    x = 103.68

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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.