Home / 1,421.22-2,131.83-447.15

Finding the Fourth Proportional to 1,421.22, 2,131.83 and 447.15

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Solution

The fourth proportional to 1,421.22, 2,131.83 and 447.15 is: 670.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.22 : 2,131.83 = 447.15 : x
  2. Step 2: Convert to fraction form
    1,421.22/2,131.83 = 447.15/x
  3. Step 3: Cross multiply
    1,421.22x = 2,131.83 × 447.15
  4. Step 4: Simplify right side
    1,421.22x = 953,247.78
  5. Step 5: Solve for x
    x = 953,247.78/1,421.22
  6. Step 6: Final answer
    x = 670.73

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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.