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Finding the Fourth Proportional to 1,428.31, 2,142.12 and 550.48

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Solution

The fourth proportional to 1,428.31, 2,142.12 and 550.48 is: 825.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.31 : 2,142.12 = 550.48 : x
  2. Step 2: Convert to fraction form
    1,428.31/2,142.12 = 550.48/x
  3. Step 3: Cross multiply
    1,428.31x = 2,142.12 × 550.48
  4. Step 4: Simplify right side
    1,428.31x = 1,179,194.22
  5. Step 5: Solve for x
    x = 1,179,194.22/1,428.31
  6. Step 6: Final answer
    x = 825.59

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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.