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Finding the Fourth Proportional to 199.88, 275.80 and 121.18

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Solution

The fourth proportional to 199.88, 275.80 and 121.18 is: 167.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.88 : 275.80 = 121.18 : x
  2. Step 2: Convert to fraction form
    199.88/275.80 = 121.18/x
  3. Step 3: Cross multiply
    199.88x = 275.80 × 121.18
  4. Step 4: Simplify right side
    199.88x = 33,421.44
  5. Step 5: Solve for x
    x = 33,421.44/199.88
  6. Step 6: Final answer
    x = 167.21

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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.