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Finding the Fourth Proportional to 1,321.63, 1,982.78 and 455.95

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Solution

The fourth proportional to 1,321.63, 1,982.78 and 455.95 is: 684.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.63 : 1,982.78 = 455.95 : x
  2. Step 2: Convert to fraction form
    1,321.63/1,982.78 = 455.95/x
  3. Step 3: Cross multiply
    1,321.63x = 1,982.78 × 455.95
  4. Step 4: Simplify right side
    1,321.63x = 904,048.54
  5. Step 5: Solve for x
    x = 904,048.54/1,321.63
  6. Step 6: Final answer
    x = 684.04

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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.