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Finding the Fourth Proportional to 453.78, 680.60 and 129.12

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Solution

The fourth proportional to 453.78, 680.60 and 129.12 is: 193.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.78 : 680.60 = 129.12 : x
  2. Step 2: Convert to fraction form
    453.78/680.60 = 129.12/x
  3. Step 3: Cross multiply
    453.78x = 680.60 × 129.12
  4. Step 4: Simplify right side
    453.78x = 87,879.07
  5. Step 5: Solve for x
    x = 87,879.07/453.78
  6. Step 6: Final answer
    x = 193.66

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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.