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Finding the Fourth Proportional to 778.99, 1,074.98 and 447.39

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Solution

The fourth proportional to 778.99, 1,074.98 and 447.39 is: 617.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.99 : 1,074.98 = 447.39 : x
  2. Step 2: Convert to fraction form
    778.99/1,074.98 = 447.39/x
  3. Step 3: Cross multiply
    778.99x = 1,074.98 × 447.39
  4. Step 4: Simplify right side
    778.99x = 480,940.45
  5. Step 5: Solve for x
    x = 480,940.45/778.99
  6. Step 6: Final answer
    x = 617.39

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1.5x scale

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.