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Finding the Fourth Proportional to 85.09, 117.17 and 83.38

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Solution

The fourth proportional to 85.09, 117.17 and 83.38 is: 114.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.09 : 117.17 = 83.38 : x
  2. Step 2: Convert to fraction form
    85.09/117.17 = 83.38/x
  3. Step 3: Cross multiply
    85.09x = 117.17 × 83.38
  4. Step 4: Simplify right side
    85.09x = 9,769.69
  5. Step 5: Solve for x
    x = 9,769.69/85.09
  6. Step 6: Final answer
    x = 114.82

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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.