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Finding the Fourth Proportional to 122.11, 183.05 and 78.81

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Solution

The fourth proportional to 122.11, 183.05 and 78.81 is: 118.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.11 : 183.05 = 78.81 : x
  2. Step 2: Convert to fraction form
    122.11/183.05 = 78.81/x
  3. Step 3: Cross multiply
    122.11x = 183.05 × 78.81
  4. Step 4: Simplify right side
    122.11x = 14,425.26
  5. Step 5: Solve for x
    x = 14,425.26/122.11
  6. Step 6: Final answer
    x = 118.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.