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Finding the Fourth Proportional to 453.68, 680.32 and 128.97

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Solution

The fourth proportional to 453.68, 680.32 and 128.97 is: 193.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.68 : 680.32 = 128.97 : x
  2. Step 2: Convert to fraction form
    453.68/680.32 = 128.97/x
  3. Step 3: Cross multiply
    453.68x = 680.32 × 128.97
  4. Step 4: Simplify right side
    453.68x = 87,742.57
  5. Step 5: Solve for x
    x = 87,742.57/453.68
  6. Step 6: Final answer
    x = 193.40

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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.