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Finding the Fourth Proportional to 121.42, 182.40 and 103.60

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Solution

The fourth proportional to 121.42, 182.40 and 103.60 is: 155.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.42 : 182.40 = 103.60 : x
  2. Step 2: Convert to fraction form
    121.42/182.40 = 103.60/x
  3. Step 3: Cross multiply
    121.42x = 182.40 × 103.60
  4. Step 4: Simplify right side
    121.42x = 18,896.64
  5. Step 5: Solve for x
    x = 18,896.64/121.42
  6. Step 6: Final answer
    x = 155.63

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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.