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Finding the Fourth Proportional to 464.78, 641.40 and 257.78

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Solution

The fourth proportional to 464.78, 641.40 and 257.78 is: 355.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.78 : 641.40 = 257.78 : x
  2. Step 2: Convert to fraction form
    464.78/641.40 = 257.78/x
  3. Step 3: Cross multiply
    464.78x = 641.40 × 257.78
  4. Step 4: Simplify right side
    464.78x = 165,340.09
  5. Step 5: Solve for x
    x = 165,340.09/464.78
  6. Step 6: Final answer
    x = 355.74

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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.