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Finding the Fourth Proportional to 426.24, 639.46 and 268.02

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Solution

The fourth proportional to 426.24, 639.46 and 268.02 is: 402.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.24 : 639.46 = 268.02 : x
  2. Step 2: Convert to fraction form
    426.24/639.46 = 268.02/x
  3. Step 3: Cross multiply
    426.24x = 639.46 × 268.02
  4. Step 4: Simplify right side
    426.24x = 171,388.07
  5. Step 5: Solve for x
    x = 171,388.07/426.24
  6. Step 6: Final answer
    x = 402.09

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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.