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Finding the Fourth Proportional to 355.58, 491.37 and 257.84

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Solution

The fourth proportional to 355.58, 491.37 and 257.84 is: 356.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.58 : 491.37 = 257.84 : x
  2. Step 2: Convert to fraction form
    355.58/491.37 = 257.84/x
  3. Step 3: Cross multiply
    355.58x = 491.37 × 257.84
  4. Step 4: Simplify right side
    355.58x = 126,694.84
  5. Step 5: Solve for x
    x = 126,694.84/355.58
  6. Step 6: Final answer
    x = 356.30

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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.