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Finding the Fourth Proportional to 148, 203.68 and 121.56

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Solution

The fourth proportional to 148, 203.68 and 121.56 is: 167.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    148 : 203.68 = 121.56 : x
  2. Step 2: Convert to fraction form
    148/203.68 = 121.56/x
  3. Step 3: Cross multiply
    148x = 203.68 × 121.56
  4. Step 4: Simplify right side
    148x = 24,759.34
  5. Step 5: Solve for x
    x = 24,759.34/148
  6. Step 6: Final answer
    x = 167.29

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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.