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Finding the Fourth Proportional to 455.78, 683.72 and 131.20

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Solution

The fourth proportional to 455.78, 683.72 and 131.20 is: 196.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.78 : 683.72 = 131.20 : x
  2. Step 2: Convert to fraction form
    455.78/683.72 = 131.20/x
  3. Step 3: Cross multiply
    455.78x = 683.72 × 131.20
  4. Step 4: Simplify right side
    455.78x = 89,699.99
  5. Step 5: Solve for x
    x = 89,699.99/455.78
  6. Step 6: Final answer
    x = 196.81

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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.