Home / 1,321.12-1,981.68-455.52

Finding the Fourth Proportional to 1,321.12, 1,981.68 and 455.52

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Solution

The fourth proportional to 1,321.12, 1,981.68 and 455.52 is: 683.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.12 : 1,981.68 = 455.52 : x
  2. Step 2: Convert to fraction form
    1,321.12/1,981.68 = 455.52/x
  3. Step 3: Cross multiply
    1,321.12x = 1,981.68 × 455.52
  4. Step 4: Simplify right side
    1,321.12x = 902,694.87
  5. Step 5: Solve for x
    x = 902,694.87/1,321.12
  6. Step 6: Final answer
    x = 683.28

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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.