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Finding the Fourth Proportional to 121.50, 182.11 and 78.03

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Solution

The fourth proportional to 121.50, 182.11 and 78.03 is: 116.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.50 : 182.11 = 78.03 : x
  2. Step 2: Convert to fraction form
    121.50/182.11 = 78.03/x
  3. Step 3: Cross multiply
    121.50x = 182.11 × 78.03
  4. Step 4: Simplify right side
    121.50x = 14,208.94
  5. Step 5: Solve for x
    x = 14,208.94/121.50
  6. Step 6: Final answer
    x = 116.95

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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.