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Finding the Fourth Proportional to 328.32, 491.90 and 198.18

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Solution

The fourth proportional to 328.32, 491.90 and 198.18 is: 296.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.32 : 491.90 = 198.18 : x
  2. Step 2: Convert to fraction form
    328.32/491.90 = 198.18/x
  3. Step 3: Cross multiply
    328.32x = 491.90 × 198.18
  4. Step 4: Simplify right side
    328.32x = 97,484.74
  5. Step 5: Solve for x
    x = 97,484.74/328.32
  6. Step 6: Final answer
    x = 296.92

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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.