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Finding the Fourth Proportional to 1,231.69, 1,699.26 and 789.52

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Solution

The fourth proportional to 1,231.69, 1,699.26 and 789.52 is: 1,089.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.69 : 1,699.26 = 789.52 : x
  2. Step 2: Convert to fraction form
    1,231.69/1,699.26 = 789.52/x
  3. Step 3: Cross multiply
    1,231.69x = 1,699.26 × 789.52
  4. Step 4: Simplify right side
    1,231.69x = 1,341,599.76
  5. Step 5: Solve for x
    x = 1,341,599.76/1,231.69
  6. Step 6: Final answer
    x = 1,089.23

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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.