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Finding the Fourth Proportional to 328.36, 491.90 and 198.40

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Solution

The fourth proportional to 328.36, 491.90 and 198.40 is: 297.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.36 : 491.90 = 198.40 : x
  2. Step 2: Convert to fraction form
    328.36/491.90 = 198.40/x
  3. Step 3: Cross multiply
    328.36x = 491.90 × 198.40
  4. Step 4: Simplify right side
    328.36x = 97,590.74
  5. Step 5: Solve for x
    x = 97,590.74/328.36
  6. Step 6: Final answer
    x = 297.21

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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.