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Finding the Fourth Proportional to 198.40, 274.06 and 155.30

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Solution

The fourth proportional to 198.40, 274.06 and 155.30 is: 214.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.40 : 274.06 = 155.30 : x
  2. Step 2: Convert to fraction form
    198.40/274.06 = 155.30/x
  3. Step 3: Cross multiply
    198.40x = 274.06 × 155.30
  4. Step 4: Simplify right side
    198.40x = 42,561.52
  5. Step 5: Solve for x
    x = 42,561.52/198.40
  6. Step 6: Final answer
    x = 214.52

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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.