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Finding the Fourth Proportional to 550.09, 825.49 and 428.59

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Solution

The fourth proportional to 550.09, 825.49 and 428.59 is: 643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.09 : 825.49 = 428.59 : x
  2. Step 2: Convert to fraction form
    550.09/825.49 = 428.59/x
  3. Step 3: Cross multiply
    550.09x = 825.49 × 428.59
  4. Step 4: Simplify right side
    550.09x = 353,798.33
  5. Step 5: Solve for x
    x = 353,798.33/550.09
  6. Step 6: Final answer
    x = 643.16

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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.