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Finding the Fourth Proportional to 122.16, 183.36 and 57.20

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Solution

The fourth proportional to 122.16, 183.36 and 57.20 is: 85.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 183.36 = 57.20 : x
  2. Step 2: Convert to fraction form
    122.16/183.36 = 57.20/x
  3. Step 3: Cross multiply
    122.16x = 183.36 × 57.20
  4. Step 4: Simplify right side
    122.16x = 10,488.42
  5. Step 5: Solve for x
    x = 10,488.42/122.16
  6. Step 6: Final answer
    x = 85.85

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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.