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Finding the Fourth Proportional to 628.12, 865.38 and 550.36

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Solution

The fourth proportional to 628.12, 865.38 and 550.36 is: 758.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.12 : 865.38 = 550.36 : x
  2. Step 2: Convert to fraction form
    628.12/865.38 = 550.36/x
  3. Step 3: Cross multiply
    628.12x = 865.38 × 550.36
  4. Step 4: Simplify right side
    628.12x = 476,270.54
  5. Step 5: Solve for x
    x = 476,270.54/628.12
  6. Step 6: Final answer
    x = 758.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.