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Finding the Fourth Proportional to 199.20, 274.64 and 155.36

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Solution

The fourth proportional to 199.20, 274.64 and 155.36 is: 214.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.20 : 274.64 = 155.36 : x
  2. Step 2: Convert to fraction form
    199.20/274.64 = 155.36/x
  3. Step 3: Cross multiply
    199.20x = 274.64 × 155.36
  4. Step 4: Simplify right side
    199.20x = 42,668.07
  5. Step 5: Solve for x
    x = 42,668.07/199.20
  6. Step 6: Final answer
    x = 214.20

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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.