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Finding the Fourth Proportional to 285.11, 427.72 and 122.79

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Solution

The fourth proportional to 285.11, 427.72 and 122.79 is: 184.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.11 : 427.72 = 122.79 : x
  2. Step 2: Convert to fraction form
    285.11/427.72 = 122.79/x
  3. Step 3: Cross multiply
    285.11x = 427.72 × 122.79
  4. Step 4: Simplify right side
    285.11x = 52,519.43
  5. Step 5: Solve for x
    x = 52,519.43/285.11
  6. Step 6: Final answer
    x = 184.21

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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.