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Finding the Fourth Proportional to 1,321.62, 1,982.92 and 456

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Solution

The fourth proportional to 1,321.62, 1,982.92 and 456 is: 684.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.62 : 1,982.92 = 456 : x
  2. Step 2: Convert to fraction form
    1,321.62/1,982.92 = 456/x
  3. Step 3: Cross multiply
    1,321.62x = 1,982.92 × 456
  4. Step 4: Simplify right side
    1,321.62x = 904,211.52
  5. Step 5: Solve for x
    x = 904,211.52/1,321.62
  6. Step 6: Final answer
    x = 684.17

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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.