Home / 1,231.20-1,846.80-769.15

Finding the Fourth Proportional to 1,231.20, 1,846.80 and 769.15

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Solution

The fourth proportional to 1,231.20, 1,846.80 and 769.15 is: 1,153.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.20 : 1,846.80 = 769.15 : x
  2. Step 2: Convert to fraction form
    1,231.20/1,846.80 = 769.15/x
  3. Step 3: Cross multiply
    1,231.20x = 1,846.80 × 769.15
  4. Step 4: Simplify right side
    1,231.20x = 1,420,458.14
  5. Step 5: Solve for x
    x = 1,420,458.14/1,231.20
  6. Step 6: Final answer
    x = 1,153.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.