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Finding the Fourth Proportional to 122.08, 183.08 and 67.20

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Solution

The fourth proportional to 122.08, 183.08 and 67.20 is: 100.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.08 : 183.08 = 67.20 : x
  2. Step 2: Convert to fraction form
    122.08/183.08 = 67.20/x
  3. Step 3: Cross multiply
    122.08x = 183.08 × 67.20
  4. Step 4: Simplify right side
    122.08x = 12,302.98
  5. Step 5: Solve for x
    x = 12,302.98/122.08
  6. Step 6: Final answer
    x = 100.78

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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.