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Finding the Fourth Proportional to 783.99, 1,081.94 and 447.99

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Solution

The fourth proportional to 783.99, 1,081.94 and 447.99 is: 618.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.99 : 1,081.94 = 447.99 : x
  2. Step 2: Convert to fraction form
    783.99/1,081.94 = 447.99/x
  3. Step 3: Cross multiply
    783.99x = 1,081.94 × 447.99
  4. Step 4: Simplify right side
    783.99x = 484,694.01
  5. Step 5: Solve for x
    x = 484,694.01/783.99
  6. Step 6: Final answer
    x = 618.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.