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Finding the Fourth Proportional to 1,231.08, 1,699.20 and 789.12

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Solution

The fourth proportional to 1,231.08, 1,699.20 and 789.12 is: 1,089.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.08 : 1,699.20 = 789.12 : x
  2. Step 2: Convert to fraction form
    1,231.08/1,699.20 = 789.12/x
  3. Step 3: Cross multiply
    1,231.08x = 1,699.20 × 789.12
  4. Step 4: Simplify right side
    1,231.08x = 1,340,872.70
  5. Step 5: Solve for x
    x = 1,340,872.70/1,231.08
  6. Step 6: Final answer
    x = 1,089.18

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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.