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Finding the Fourth Proportional to 453.49, 680.17 and 128.88

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Solution

The fourth proportional to 453.49, 680.17 and 128.88 is: 193.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.49 : 680.17 = 128.88 : x
  2. Step 2: Convert to fraction form
    453.49/680.17 = 128.88/x
  3. Step 3: Cross multiply
    453.49x = 680.17 × 128.88
  4. Step 4: Simplify right side
    453.49x = 87,660.31
  5. Step 5: Solve for x
    x = 87,660.31/453.49
  6. Step 6: Final answer
    x = 193.30

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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.