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Finding the Fourth Proportional to 198.59, 274.00 and 128.69

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Solution

The fourth proportional to 198.59, 274.00 and 128.69 is: 177.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.59 : 274.00 = 128.69 : x
  2. Step 2: Convert to fraction form
    198.59/274.00 = 128.69/x
  3. Step 3: Cross multiply
    198.59x = 274.00 × 128.69
  4. Step 4: Simplify right side
    198.59x = 35,260.40
  5. Step 5: Solve for x
    x = 35,260.40/198.59
  6. Step 6: Final answer
    x = 177.55

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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.