Home / 2,609.40-3,911.26-1,221.87

Finding the Fourth Proportional to 2,609.40, 3,911.26 and 1,221.87

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Solution

The fourth proportional to 2,609.40, 3,911.26 and 1,221.87 is: 1,831.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,609.40 : 3,911.26 = 1,221.87 : x
  2. Step 2: Convert to fraction form
    2,609.40/3,911.26 = 1,221.87/x
  3. Step 3: Cross multiply
    2,609.40x = 3,911.26 × 1,221.87
  4. Step 4: Simplify right side
    2,609.40x = 4,779,028.65
  5. Step 5: Solve for x
    x = 4,779,028.65/2,609.40
  6. Step 6: Final answer
    x = 1,831.47

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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.