Home / 1,321.28-1,982.16-455.36

Finding the Fourth Proportional to 1,321.28, 1,982.16 and 455.36

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Solution

The fourth proportional to 1,321.28, 1,982.16 and 455.36 is: 683.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.28 : 1,982.16 = 455.36 : x
  2. Step 2: Convert to fraction form
    1,321.28/1,982.16 = 455.36/x
  3. Step 3: Cross multiply
    1,321.28x = 1,982.16 × 455.36
  4. Step 4: Simplify right side
    1,321.28x = 902,596.38
  5. Step 5: Solve for x
    x = 902,596.38/1,321.28
  6. Step 6: Final answer
    x = 683.12

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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.