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Finding the Fourth Proportional to 435.39, 648.39 and 426.39

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Solution

The fourth proportional to 435.39, 648.39 and 426.39 is: 634.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.39 : 648.39 = 426.39 : x
  2. Step 2: Convert to fraction form
    435.39/648.39 = 426.39/x
  3. Step 3: Cross multiply
    435.39x = 648.39 × 426.39
  4. Step 4: Simplify right side
    435.39x = 276,467.01
  5. Step 5: Solve for x
    x = 276,467.01/435.39
  6. Step 6: Final answer
    x = 634.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.