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Finding the Fourth Proportional to 338.78, 467.55 and 256.30

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Solution

The fourth proportional to 338.78, 467.55 and 256.30 is: 353.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.78 : 467.55 = 256.30 : x
  2. Step 2: Convert to fraction form
    338.78/467.55 = 256.30/x
  3. Step 3: Cross multiply
    338.78x = 467.55 × 256.30
  4. Step 4: Simplify right side
    338.78x = 119,833.07
  5. Step 5: Solve for x
    x = 119,833.07/338.78
  6. Step 6: Final answer
    x = 353.72

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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.