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Finding the Fourth Proportional to 455.72, 683.49 and 131.09

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Solution

The fourth proportional to 455.72, 683.49 and 131.09 is: 196.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.72 : 683.49 = 131.09 : x
  2. Step 2: Convert to fraction form
    455.72/683.49 = 131.09/x
  3. Step 3: Cross multiply
    455.72x = 683.49 × 131.09
  4. Step 4: Simplify right side
    455.72x = 89,598.70
  5. Step 5: Solve for x
    x = 89,598.70/455.72
  6. Step 6: Final answer
    x = 196.61

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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.