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Finding the Fourth Proportional to 443.89, 612.58 and 257.44

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Solution

The fourth proportional to 443.89, 612.58 and 257.44 is: 355.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.89 : 612.58 = 257.44 : x
  2. Step 2: Convert to fraction form
    443.89/612.58 = 257.44/x
  3. Step 3: Cross multiply
    443.89x = 612.58 × 257.44
  4. Step 4: Simplify right side
    443.89x = 157,702.60
  5. Step 5: Solve for x
    x = 157,702.60/443.89
  6. Step 6: Final answer
    x = 355.27

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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.