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Finding the Fourth Proportional to 328.20, 491.94 and 206.31

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Solution

The fourth proportional to 328.20, 491.94 and 206.31 is: 309.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.20 : 491.94 = 206.31 : x
  2. Step 2: Convert to fraction form
    328.20/491.94 = 206.31/x
  3. Step 3: Cross multiply
    328.20x = 491.94 × 206.31
  4. Step 4: Simplify right side
    328.20x = 101,492.14
  5. Step 5: Solve for x
    x = 101,492.14/328.20
  6. Step 6: Final answer
    x = 309.24

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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.