Home / 1,421.13-2,131.71-447.24

Finding the Fourth Proportional to 1,421.13, 2,131.71 and 447.24

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Solution

The fourth proportional to 1,421.13, 2,131.71 and 447.24 is: 670.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.13 : 2,131.71 = 447.24 : x
  2. Step 2: Convert to fraction form
    1,421.13/2,131.71 = 447.24/x
  3. Step 3: Cross multiply
    1,421.13x = 2,131.71 × 447.24
  4. Step 4: Simplify right side
    1,421.13x = 953,385.98
  5. Step 5: Solve for x
    x = 953,385.98/1,421.13
  6. Step 6: Final answer
    x = 670.86

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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.