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Finding the Fourth Proportional to 69.72, 105.24 and 66

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Solution

The fourth proportional to 69.72, 105.24 and 66 is: 99.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.72 : 105.24 = 66 : x
  2. Step 2: Convert to fraction form
    69.72/105.24 = 66/x
  3. Step 3: Cross multiply
    69.72x = 105.24 × 66
  4. Step 4: Simplify right side
    69.72x = 6,945.84
  5. Step 5: Solve for x
    x = 6,945.84/69.72
  6. Step 6: Final answer
    x = 99.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.