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Finding the Fourth Proportional to 768.94, 1,153.82 and 336.40

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Solution

The fourth proportional to 768.94, 1,153.82 and 336.40 is: 504.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.94 : 1,153.82 = 336.40 : x
  2. Step 2: Convert to fraction form
    768.94/1,153.82 = 336.40/x
  3. Step 3: Cross multiply
    768.94x = 1,153.82 × 336.40
  4. Step 4: Simplify right side
    768.94x = 388,143.37
  5. Step 5: Solve for x
    x = 388,143.37/768.94
  6. Step 6: Final answer
    x = 504.78

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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.