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Finding the Fourth Proportional to 84.81, 117.07 and 49.85

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Solution

The fourth proportional to 84.81, 117.07 and 49.85 is: 68.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.81 : 117.07 = 49.85 : x
  2. Step 2: Convert to fraction form
    84.81/117.07 = 49.85/x
  3. Step 3: Cross multiply
    84.81x = 117.07 × 49.85
  4. Step 4: Simplify right side
    84.81x = 5,835.94
  5. Step 5: Solve for x
    x = 5,835.94/84.81
  6. Step 6: Final answer
    x = 68.81

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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.