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Finding the Fourth Proportional to 328.42, 491.92 and 191.33

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Solution

The fourth proportional to 328.42, 491.92 and 191.33 is: 286.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.42 : 491.92 = 191.33 : x
  2. Step 2: Convert to fraction form
    328.42/491.92 = 191.33/x
  3. Step 3: Cross multiply
    328.42x = 491.92 × 191.33
  4. Step 4: Simplify right side
    328.42x = 94,119.05
  5. Step 5: Solve for x
    x = 94,119.05/328.42
  6. Step 6: Final answer
    x = 286.58

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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.