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Finding the Fourth Proportional to 72.88, 108.60 and 69.60

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Solution

The fourth proportional to 72.88, 108.60 and 69.60 is: 103.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.88 : 108.60 = 69.60 : x
  2. Step 2: Convert to fraction form
    72.88/108.60 = 69.60/x
  3. Step 3: Cross multiply
    72.88x = 108.60 × 69.60
  4. Step 4: Simplify right side
    72.88x = 7,558.56
  5. Step 5: Solve for x
    x = 7,558.56/72.88
  6. Step 6: Final answer
    x = 103.71

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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.