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Finding the Fourth Proportional to 453.70, 680.39 and 128.98

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Solution

The fourth proportional to 453.70, 680.39 and 128.98 is: 193.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.70 : 680.39 = 128.98 : x
  2. Step 2: Convert to fraction form
    453.70/680.39 = 128.98/x
  3. Step 3: Cross multiply
    453.70x = 680.39 × 128.98
  4. Step 4: Simplify right side
    453.70x = 87,756.70
  5. Step 5: Solve for x
    x = 87,756.70/453.70
  6. Step 6: Final answer
    x = 193.42

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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.