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Finding the Fourth Proportional to 355.96, 491.21 and 198.59

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Solution

The fourth proportional to 355.96, 491.21 and 198.59 is: 274.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.96 : 491.21 = 198.59 : x
  2. Step 2: Convert to fraction form
    355.96/491.21 = 198.59/x
  3. Step 3: Cross multiply
    355.96x = 491.21 × 198.59
  4. Step 4: Simplify right side
    355.96x = 97,550.75
  5. Step 5: Solve for x
    x = 97,550.75/355.96
  6. Step 6: Final answer
    x = 274.05

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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.