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Finding the Fourth Proportional to 69.69, 103.97 and 65.43

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Solution

The fourth proportional to 69.69, 103.97 and 65.43 is: 97.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.69 : 103.97 = 65.43 : x
  2. Step 2: Convert to fraction form
    69.69/103.97 = 65.43/x
  3. Step 3: Cross multiply
    69.69x = 103.97 × 65.43
  4. Step 4: Simplify right side
    69.69x = 6,802.76
  5. Step 5: Solve for x
    x = 6,802.76/69.69
  6. Step 6: Final answer
    x = 97.61

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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.