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Finding the Fourth Proportional to 338.08, 506.90 and 121.60

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Solution

The fourth proportional to 338.08, 506.90 and 121.60 is: 182.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.08 : 506.90 = 121.60 : x
  2. Step 2: Convert to fraction form
    338.08/506.90 = 121.60/x
  3. Step 3: Cross multiply
    338.08x = 506.90 × 121.60
  4. Step 4: Simplify right side
    338.08x = 61,639.04
  5. Step 5: Solve for x
    x = 61,639.04/338.08
  6. Step 6: Final answer
    x = 182.32

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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.