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Finding the Fourth Proportional to 189.94, 285.38 and 121.49

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Solution

The fourth proportional to 189.94, 285.38 and 121.49 is: 182.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.94 : 285.38 = 121.49 : x
  2. Step 2: Convert to fraction form
    189.94/285.38 = 121.49/x
  3. Step 3: Cross multiply
    189.94x = 285.38 × 121.49
  4. Step 4: Simplify right side
    189.94x = 34,670.82
  5. Step 5: Solve for x
    x = 34,670.82/189.94
  6. Step 6: Final answer
    x = 182.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.