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Finding the Fourth Proportional to 453.43, 680.19 and 128.80

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Solution

The fourth proportional to 453.43, 680.19 and 128.80 is: 193.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.43 : 680.19 = 128.80 : x
  2. Step 2: Convert to fraction form
    453.43/680.19 = 128.80/x
  3. Step 3: Cross multiply
    453.43x = 680.19 × 128.80
  4. Step 4: Simplify right side
    453.43x = 87,608.47
  5. Step 5: Solve for x
    x = 87,608.47/453.43
  6. Step 6: Final answer
    x = 193.21

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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.