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Finding the Fourth Proportional to 338.94, 467.64 and 312.78

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Solution

The fourth proportional to 338.94, 467.64 and 312.78 is: 431.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.94 : 467.64 = 312.78 : x
  2. Step 2: Convert to fraction form
    338.94/467.64 = 312.78/x
  3. Step 3: Cross multiply
    338.94x = 467.64 × 312.78
  4. Step 4: Simplify right side
    338.94x = 146,268.44
  5. Step 5: Solve for x
    x = 146,268.44/338.94
  6. Step 6: Final answer
    x = 431.55

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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.