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Finding the Fourth Proportional to 122.20, 183.31 and 56.32

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Solution

The fourth proportional to 122.20, 183.31 and 56.32 is: 84.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.20 : 183.31 = 56.32 : x
  2. Step 2: Convert to fraction form
    122.20/183.31 = 56.32/x
  3. Step 3: Cross multiply
    122.20x = 183.31 × 56.32
  4. Step 4: Simplify right side
    122.20x = 10,324.02
  5. Step 5: Solve for x
    x = 10,324.02/122.20
  6. Step 6: Final answer
    x = 84.48

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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.