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Finding the Fourth Proportional to 778.77, 1,168.25 and 259.15

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Solution

The fourth proportional to 778.77, 1,168.25 and 259.15 is: 388.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.77 : 1,168.25 = 259.15 : x
  2. Step 2: Convert to fraction form
    778.77/1,168.25 = 259.15/x
  3. Step 3: Cross multiply
    778.77x = 1,168.25 × 259.15
  4. Step 4: Simplify right side
    778.77x = 302,751.99
  5. Step 5: Solve for x
    x = 302,751.99/778.77
  6. Step 6: Final answer
    x = 388.76

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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.