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Finding the Fourth Proportional to 328.37, 491.90 and 198.39

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Solution

The fourth proportional to 328.37, 491.90 and 198.39 is: 297.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.37 : 491.90 = 198.39 : x
  2. Step 2: Convert to fraction form
    328.37/491.90 = 198.39/x
  3. Step 3: Cross multiply
    328.37x = 491.90 × 198.39
  4. Step 4: Simplify right side
    328.37x = 97,587.05
  5. Step 5: Solve for x
    x = 97,587.05/328.37
  6. Step 6: Final answer
    x = 297.19

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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.