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Finding the Fourth Proportional to 199.84, 275.75 and 121.17

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Solution

The fourth proportional to 199.84, 275.75 and 121.17 is: 167.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.84 : 275.75 = 121.17 : x
  2. Step 2: Convert to fraction form
    199.84/275.75 = 121.17/x
  3. Step 3: Cross multiply
    199.84x = 275.75 × 121.17
  4. Step 4: Simplify right side
    199.84x = 33,413.03
  5. Step 5: Solve for x
    x = 33,413.03/199.84
  6. Step 6: Final answer
    x = 167.20

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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.