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Finding the Fourth Proportional to 1,231.43, 1,698.41 and 789.36

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Solution

The fourth proportional to 1,231.43, 1,698.41 and 789.36 is: 1,088.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.43 : 1,698.41 = 789.36 : x
  2. Step 2: Convert to fraction form
    1,231.43/1,698.41 = 789.36/x
  3. Step 3: Cross multiply
    1,231.43x = 1,698.41 × 789.36
  4. Step 4: Simplify right side
    1,231.43x = 1,340,652.97
  5. Step 5: Solve for x
    x = 1,340,652.97/1,231.43
  6. Step 6: Final answer
    x = 1,088.70

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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.