Home / 1,421.21-2,131.26-680.69

Finding the Fourth Proportional to 1,421.21, 2,131.26 and 680.69

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Solution

The fourth proportional to 1,421.21, 2,131.26 and 680.69 is: 1,020.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.21 : 2,131.26 = 680.69 : x
  2. Step 2: Convert to fraction form
    1,421.21/2,131.26 = 680.69/x
  3. Step 3: Cross multiply
    1,421.21x = 2,131.26 × 680.69
  4. Step 4: Simplify right side
    1,421.21x = 1,450,716.71
  5. Step 5: Solve for x
    x = 1,450,716.71/1,421.21
  6. Step 6: Final answer
    x = 1,020.77

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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.