Home / 1,243.80-1,865.55-513.29

Finding the Fourth Proportional to 1,243.80, 1,865.55 and 513.29

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Solution

The fourth proportional to 1,243.80, 1,865.55 and 513.29 is: 769.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.80 : 1,865.55 = 513.29 : x
  2. Step 2: Convert to fraction form
    1,243.80/1,865.55 = 513.29/x
  3. Step 3: Cross multiply
    1,243.80x = 1,865.55 × 513.29
  4. Step 4: Simplify right side
    1,243.80x = 957,558.83
  5. Step 5: Solve for x
    x = 957,558.83/1,243.80
  6. Step 6: Final answer
    x = 769.87

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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.