Home / 1,321.23-1,982.09-443.65

Finding the Fourth Proportional to 1,321.23, 1,982.09 and 443.65

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Solution

The fourth proportional to 1,321.23, 1,982.09 and 443.65 is: 665.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.23 : 1,982.09 = 443.65 : x
  2. Step 2: Convert to fraction form
    1,321.23/1,982.09 = 443.65/x
  3. Step 3: Cross multiply
    1,321.23x = 1,982.09 × 443.65
  4. Step 4: Simplify right side
    1,321.23x = 879,354.23
  5. Step 5: Solve for x
    x = 879,354.23/1,321.23
  6. Step 6: Final answer
    x = 665.56

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1.5x scale

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.