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Finding the Fourth Proportional to 122.07, 183.12 and 105.78

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Solution

The fourth proportional to 122.07, 183.12 and 105.78 is: 158.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.07 : 183.12 = 105.78 : x
  2. Step 2: Convert to fraction form
    122.07/183.12 = 105.78/x
  3. Step 3: Cross multiply
    122.07x = 183.12 × 105.78
  4. Step 4: Simplify right side
    122.07x = 19,370.95
  5. Step 5: Solve for x
    x = 19,370.95/122.07
  6. Step 6: Final answer
    x = 158.69

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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.