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Finding the Fourth Proportional to 71.06, 105.84 and 69.56

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Solution

The fourth proportional to 71.06, 105.84 and 69.56 is: 103.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.06 : 105.84 = 69.56 : x
  2. Step 2: Convert to fraction form
    71.06/105.84 = 69.56/x
  3. Step 3: Cross multiply
    71.06x = 105.84 × 69.56
  4. Step 4: Simplify right side
    71.06x = 7,361.88
  5. Step 5: Solve for x
    x = 7,361.88/71.06
  6. Step 6: Final answer
    x = 103.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.