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Finding the Fourth Proportional to 1,321.99, 1,983.12 and 456.19

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Solution

The fourth proportional to 1,321.99, 1,983.12 and 456.19 is: 684.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.99 : 1,983.12 = 456.19 : x
  2. Step 2: Convert to fraction form
    1,321.99/1,983.12 = 456.19/x
  3. Step 3: Cross multiply
    1,321.99x = 1,983.12 × 456.19
  4. Step 4: Simplify right side
    1,321.99x = 904,672.84
  5. Step 5: Solve for x
    x = 904,672.84/1,321.99
  6. Step 6: Final answer
    x = 684.33

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1.5x scale

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.