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Finding the Fourth Proportional to 496.32, 684.72 and 309.78

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Solution

The fourth proportional to 496.32, 684.72 and 309.78 is: 427.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    496.32 : 684.72 = 309.78 : x
  2. Step 2: Convert to fraction form
    496.32/684.72 = 309.78/x
  3. Step 3: Cross multiply
    496.32x = 684.72 × 309.78
  4. Step 4: Simplify right side
    496.32x = 212,112.56
  5. Step 5: Solve for x
    x = 212,112.56/496.32
  6. Step 6: Final answer
    x = 427.37

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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.