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Finding the Fourth Proportional to 285.15, 427.74 and 136.86

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Solution

The fourth proportional to 285.15, 427.74 and 136.86 is: 205.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.15 : 427.74 = 136.86 : x
  2. Step 2: Convert to fraction form
    285.15/427.74 = 136.86/x
  3. Step 3: Cross multiply
    285.15x = 427.74 × 136.86
  4. Step 4: Simplify right side
    285.15x = 58,540.50
  5. Step 5: Solve for x
    x = 58,540.50/285.15
  6. Step 6: Final answer
    x = 205.30

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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.