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Finding the Fourth Proportional to 1,022.92, 1,412.39 and 905.02

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Solution

The fourth proportional to 1,022.92, 1,412.39 and 905.02 is: 1,249.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022.92 : 1,412.39 = 905.02 : x
  2. Step 2: Convert to fraction form
    1,022.92/1,412.39 = 905.02/x
  3. Step 3: Cross multiply
    1,022.92x = 1,412.39 × 905.02
  4. Step 4: Simplify right side
    1,022.92x = 1,278,241.20
  5. Step 5: Solve for x
    x = 1,278,241.20/1,022.92
  6. Step 6: Final answer
    x = 1,249.60

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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.