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Finding the Fourth Proportional to 778.63, 1,074.40 and 447

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Solution

The fourth proportional to 778.63, 1,074.40 and 447 is: 616.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.63 : 1,074.40 = 447 : x
  2. Step 2: Convert to fraction form
    778.63/1,074.40 = 447/x
  3. Step 3: Cross multiply
    778.63x = 1,074.40 × 447
  4. Step 4: Simplify right side
    778.63x = 480,256.80
  5. Step 5: Solve for x
    x = 480,256.80/778.63
  6. Step 6: Final answer
    x = 616.80

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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.