Home / 1,421.35-2,131.92-447.42

Finding the Fourth Proportional to 1,421.35, 2,131.92 and 447.42

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Solution

The fourth proportional to 1,421.35, 2,131.92 and 447.42 is: 671.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.35 : 2,131.92 = 447.42 : x
  2. Step 2: Convert to fraction form
    1,421.35/2,131.92 = 447.42/x
  3. Step 3: Cross multiply
    1,421.35x = 2,131.92 × 447.42
  4. Step 4: Simplify right side
    1,421.35x = 953,871.64
  5. Step 5: Solve for x
    x = 953,871.64/1,421.35
  6. Step 6: Final answer
    x = 671.10

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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.