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Finding the Fourth Proportional to 429.04, 642.72 and 255.28

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Solution

The fourth proportional to 429.04, 642.72 and 255.28 is: 382.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.04 : 642.72 = 255.28 : x
  2. Step 2: Convert to fraction form
    429.04/642.72 = 255.28/x
  3. Step 3: Cross multiply
    429.04x = 642.72 × 255.28
  4. Step 4: Simplify right side
    429.04x = 164,073.56
  5. Step 5: Solve for x
    x = 164,073.56/429.04
  6. Step 6: Final answer
    x = 382.42

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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.