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Finding the Fourth Proportional to 198.99, 274.70 and 152.55

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Solution

The fourth proportional to 198.99, 274.70 and 152.55 is: 210.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.99 : 274.70 = 152.55 : x
  2. Step 2: Convert to fraction form
    198.99/274.70 = 152.55/x
  3. Step 3: Cross multiply
    198.99x = 274.70 × 152.55
  4. Step 4: Simplify right side
    198.99x = 41,905.49
  5. Step 5: Solve for x
    x = 41,905.49/198.99
  6. Step 6: Final answer
    x = 210.59

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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.