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Finding the Fourth Proportional to 69.36, 103.68 and 66.48

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Solution

The fourth proportional to 69.36, 103.68 and 66.48 is: 99.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.36 : 103.68 = 66.48 : x
  2. Step 2: Convert to fraction form
    69.36/103.68 = 66.48/x
  3. Step 3: Cross multiply
    69.36x = 103.68 × 66.48
  4. Step 4: Simplify right side
    69.36x = 6,892.65
  5. Step 5: Solve for x
    x = 6,892.65/69.36
  6. Step 6: Final answer
    x = 99.37

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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.