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Finding the Fourth Proportional to 328.12, 491.92 and 189.28

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Solution

The fourth proportional to 328.12, 491.92 and 189.28 is: 283.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.12 : 491.92 = 189.28 : x
  2. Step 2: Convert to fraction form
    328.12/491.92 = 189.28/x
  3. Step 3: Cross multiply
    328.12x = 491.92 × 189.28
  4. Step 4: Simplify right side
    328.12x = 93,110.62
  5. Step 5: Solve for x
    x = 93,110.62/328.12
  6. Step 6: Final answer
    x = 283.77

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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.