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Finding the Fourth Proportional to 1,231.72, 1,698.99 and 789.91

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Solution

The fourth proportional to 1,231.72, 1,698.99 and 789.91 is: 1,089.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.72 : 1,698.99 = 789.91 : x
  2. Step 2: Convert to fraction form
    1,231.72/1,698.99 = 789.91/x
  3. Step 3: Cross multiply
    1,231.72x = 1,698.99 × 789.91
  4. Step 4: Simplify right side
    1,231.72x = 1,342,040.70
  5. Step 5: Solve for x
    x = 1,342,040.70/1,231.72
  6. Step 6: Final answer
    x = 1,089.57

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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.