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Finding the Fourth Proportional to 355.86, 490.40 and 257.44

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Solution

The fourth proportional to 355.86, 490.40 and 257.44 is: 354.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.86 : 490.40 = 257.44 : x
  2. Step 2: Convert to fraction form
    355.86/490.40 = 257.44/x
  3. Step 3: Cross multiply
    355.86x = 490.40 × 257.44
  4. Step 4: Simplify right side
    355.86x = 126,248.58
  5. Step 5: Solve for x
    x = 126,248.58/355.86
  6. Step 6: Final answer
    x = 354.77

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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.