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Finding the Fourth Proportional to 778.62, 1,168.36 and 518.74

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Solution

The fourth proportional to 778.62, 1,168.36 and 518.74 is: 778.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.62 : 1,168.36 = 518.74 : x
  2. Step 2: Convert to fraction form
    778.62/1,168.36 = 518.74/x
  3. Step 3: Cross multiply
    778.62x = 1,168.36 × 518.74
  4. Step 4: Simplify right side
    778.62x = 606,075.07
  5. Step 5: Solve for x
    x = 606,075.07/778.62
  6. Step 6: Final answer
    x = 778.40

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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.