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Finding the Fourth Proportional to 778.95, 1,074.45 and 613.10

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Solution

The fourth proportional to 778.95, 1,074.45 and 613.10 is: 845.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.95 : 1,074.45 = 613.10 : x
  2. Step 2: Convert to fraction form
    778.95/1,074.45 = 613.10/x
  3. Step 3: Cross multiply
    778.95x = 1,074.45 × 613.10
  4. Step 4: Simplify right side
    778.95x = 658,739.92
  5. Step 5: Solve for x
    x = 658,739.92/778.95
  6. Step 6: Final answer
    x = 845.68

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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.