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Finding the Fourth Proportional to 285.22, 427.91 and 122.87

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Solution

The fourth proportional to 285.22, 427.91 and 122.87 is: 184.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.22 : 427.91 = 122.87 : x
  2. Step 2: Convert to fraction form
    285.22/427.91 = 122.87/x
  3. Step 3: Cross multiply
    285.22x = 427.91 × 122.87
  4. Step 4: Simplify right side
    285.22x = 52,574.55
  5. Step 5: Solve for x
    x = 52,574.55/285.22
  6. Step 6: Final answer
    x = 184.33

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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.