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Finding the Fourth Proportional to 1,431.62, 2,147.42 and 806.97

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Solution

The fourth proportional to 1,431.62, 2,147.42 and 806.97 is: 1,210.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.62 : 2,147.42 = 806.97 : x
  2. Step 2: Convert to fraction form
    1,431.62/2,147.42 = 806.97/x
  3. Step 3: Cross multiply
    1,431.62x = 2,147.42 × 806.97
  4. Step 4: Simplify right side
    1,431.62x = 1,732,893.45
  5. Step 5: Solve for x
    x = 1,732,893.45/1,431.62
  6. Step 6: Final answer
    x = 1,210.44

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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.