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Finding the Fourth Proportional to 73.81, 111.26 and 68.86

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Solution

The fourth proportional to 73.81, 111.26 and 68.86 is: 103.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.81 : 111.26 = 68.86 : x
  2. Step 2: Convert to fraction form
    73.81/111.26 = 68.86/x
  3. Step 3: Cross multiply
    73.81x = 111.26 × 68.86
  4. Step 4: Simplify right side
    73.81x = 7,661.36
  5. Step 5: Solve for x
    x = 7,661.36/73.81
  6. Step 6: Final answer
    x = 103.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.