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Finding the Fourth Proportional to 426.25, 639.74 and 264.07

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Solution

The fourth proportional to 426.25, 639.74 and 264.07 is: 396.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.25 : 639.74 = 264.07 : x
  2. Step 2: Convert to fraction form
    426.25/639.74 = 264.07/x
  3. Step 3: Cross multiply
    426.25x = 639.74 × 264.07
  4. Step 4: Simplify right side
    426.25x = 168,936.14
  5. Step 5: Solve for x
    x = 168,936.14/426.25
  6. Step 6: Final answer
    x = 396.33

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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.