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Finding the Fourth Proportional to 778.85, 1,168.21 and 258.68

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Solution

The fourth proportional to 778.85, 1,168.21 and 258.68 is: 388.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.85 : 1,168.21 = 258.68 : x
  2. Step 2: Convert to fraction form
    778.85/1,168.21 = 258.68/x
  3. Step 3: Cross multiply
    778.85x = 1,168.21 × 258.68
  4. Step 4: Simplify right side
    778.85x = 302,192.56
  5. Step 5: Solve for x
    x = 302,192.56/778.85
  6. Step 6: Final answer
    x = 388.00

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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.