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Finding the Fourth Proportional to 355.40, 490.43 and 198.02

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Solution

The fourth proportional to 355.40, 490.43 and 198.02 is: 273.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 490.43 = 198.02 : x
  2. Step 2: Convert to fraction form
    355.40/490.43 = 198.02/x
  3. Step 3: Cross multiply
    355.40x = 490.43 × 198.02
  4. Step 4: Simplify right side
    355.40x = 97,111.51
  5. Step 5: Solve for x
    x = 97,111.51/355.40
  6. Step 6: Final answer
    x = 273.25

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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.