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Finding the Fourth Proportional to 453.52, 680.21 and 128.81

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Solution

The fourth proportional to 453.52, 680.21 and 128.81 is: 193.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.52 : 680.21 = 128.81 : x
  2. Step 2: Convert to fraction form
    453.52/680.21 = 128.81/x
  3. Step 3: Cross multiply
    453.52x = 680.21 × 128.81
  4. Step 4: Simplify right side
    453.52x = 87,618.91
  5. Step 5: Solve for x
    x = 87,618.91/453.52
  6. Step 6: Final answer
    x = 193.20

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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.