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Finding the Fourth Proportional to 202.99, 304.20 and 121.90

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Solution

The fourth proportional to 202.99, 304.20 and 121.90 is: 182.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.99 : 304.20 = 121.90 : x
  2. Step 2: Convert to fraction form
    202.99/304.20 = 121.90/x
  3. Step 3: Cross multiply
    202.99x = 304.20 × 121.90
  4. Step 4: Simplify right side
    202.99x = 37,081.98
  5. Step 5: Solve for x
    x = 37,081.98/202.99
  6. Step 6: Final answer
    x = 182.68

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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.