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Finding the Fourth Proportional to 328.38, 492.74 and 212.79

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Solution

The fourth proportional to 328.38, 492.74 and 212.79 is: 319.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.38 : 492.74 = 212.79 : x
  2. Step 2: Convert to fraction form
    328.38/492.74 = 212.79/x
  3. Step 3: Cross multiply
    328.38x = 492.74 × 212.79
  4. Step 4: Simplify right side
    328.38x = 104,852.52
  5. Step 5: Solve for x
    x = 104,852.52/328.38
  6. Step 6: Final answer
    x = 319.30

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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.