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Finding the Fourth Proportional to 122.42, 183.45 and 53.91

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Solution

The fourth proportional to 122.42, 183.45 and 53.91 is: 80.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.42 : 183.45 = 53.91 : x
  2. Step 2: Convert to fraction form
    122.42/183.45 = 53.91/x
  3. Step 3: Cross multiply
    122.42x = 183.45 × 53.91
  4. Step 4: Simplify right side
    122.42x = 9,889.79
  5. Step 5: Solve for x
    x = 9,889.79/122.42
  6. Step 6: Final answer
    x = 80.79

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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.