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Finding the Fourth Proportional to 1,281.22, 1,921.42 and 550.33

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Solution

The fourth proportional to 1,281.22, 1,921.42 and 550.33 is: 825.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.22 : 1,921.42 = 550.33 : x
  2. Step 2: Convert to fraction form
    1,281.22/1,921.42 = 550.33/x
  3. Step 3: Cross multiply
    1,281.22x = 1,921.42 × 550.33
  4. Step 4: Simplify right side
    1,281.22x = 1,057,415.07
  5. Step 5: Solve for x
    x = 1,057,415.07/1,281.22
  6. Step 6: Final answer
    x = 825.32

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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.