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Finding the Fourth Proportional to 199, 274.76 and 121.51

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Solution

The fourth proportional to 199, 274.76 and 121.51 is: 167.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    199 : 274.76 = 121.51 : x
  2. Step 2: Convert to fraction form
    199/274.76 = 121.51/x
  3. Step 3: Cross multiply
    199x = 274.76 × 121.51
  4. Step 4: Simplify right side
    199x = 33,385.48
  5. Step 5: Solve for x
    x = 33,385.48/199
  6. Step 6: Final answer
    x = 167.77

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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.