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Finding the Fourth Proportional to 453.36, 680.08 and 128.74

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Solution

The fourth proportional to 453.36, 680.08 and 128.74 is: 193.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.36 : 680.08 = 128.74 : x
  2. Step 2: Convert to fraction form
    453.36/680.08 = 128.74/x
  3. Step 3: Cross multiply
    453.36x = 680.08 × 128.74
  4. Step 4: Simplify right side
    453.36x = 87,553.50
  5. Step 5: Solve for x
    x = 87,553.50/453.36
  6. Step 6: Final answer
    x = 193.12

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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.