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Finding the Fourth Proportional to 84.69, 116.78 and 68.09

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Solution

The fourth proportional to 84.69, 116.78 and 68.09 is: 93.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.69 : 116.78 = 68.09 : x
  2. Step 2: Convert to fraction form
    84.69/116.78 = 68.09/x
  3. Step 3: Cross multiply
    84.69x = 116.78 × 68.09
  4. Step 4: Simplify right side
    84.69x = 7,950.63
  5. Step 5: Solve for x
    x = 7,950.63/84.69
  6. Step 6: Final answer
    x = 93.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.