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Finding the Fourth Proportional to 85.29, 117.74 and 80.83

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Solution

The fourth proportional to 85.29, 117.74 and 80.83 is: 111.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.29 : 117.74 = 80.83 : x
  2. Step 2: Convert to fraction form
    85.29/117.74 = 80.83/x
  3. Step 3: Cross multiply
    85.29x = 117.74 × 80.83
  4. Step 4: Simplify right side
    85.29x = 9,516.92
  5. Step 5: Solve for x
    x = 9,516.92/85.29
  6. Step 6: Final answer
    x = 111.58

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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.