Home / 1,321.38-1,982.28-455.76

Finding the Fourth Proportional to 1,321.38, 1,982.28 and 455.76

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Solution

The fourth proportional to 1,321.38, 1,982.28 and 455.76 is: 683.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.38 : 1,982.28 = 455.76 : x
  2. Step 2: Convert to fraction form
    1,321.38/1,982.28 = 455.76/x
  3. Step 3: Cross multiply
    1,321.38x = 1,982.28 × 455.76
  4. Step 4: Simplify right side
    1,321.38x = 903,443.93
  5. Step 5: Solve for x
    x = 903,443.93/1,321.38
  6. Step 6: Final answer
    x = 683.71

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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.