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Finding the Fourth Proportional to 329.28, 453.30 and 287.70

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Solution

The fourth proportional to 329.28, 453.30 and 287.70 is: 396.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.28 : 453.30 = 287.70 : x
  2. Step 2: Convert to fraction form
    329.28/453.30 = 287.70/x
  3. Step 3: Cross multiply
    329.28x = 453.30 × 287.70
  4. Step 4: Simplify right side
    329.28x = 130,414.41
  5. Step 5: Solve for x
    x = 130,414.41/329.28
  6. Step 6: Final answer
    x = 396.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.