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Finding the Fourth Proportional to 328.15, 491.97 and 198.15

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Solution

The fourth proportional to 328.15, 491.97 and 198.15 is: 297.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.15 : 491.97 = 198.15 : x
  2. Step 2: Convert to fraction form
    328.15/491.97 = 198.15/x
  3. Step 3: Cross multiply
    328.15x = 491.97 × 198.15
  4. Step 4: Simplify right side
    328.15x = 97,483.86
  5. Step 5: Solve for x
    x = 97,483.86/328.15
  6. Step 6: Final answer
    x = 297.07

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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.