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Finding the Fourth Proportional to 328.72, 453.64 and 212.49

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Solution

The fourth proportional to 328.72, 453.64 and 212.49 is: 293.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.72 : 453.64 = 212.49 : x
  2. Step 2: Convert to fraction form
    328.72/453.64 = 212.49/x
  3. Step 3: Cross multiply
    328.72x = 453.64 × 212.49
  4. Step 4: Simplify right side
    328.72x = 96,391.70
  5. Step 5: Solve for x
    x = 96,391.70/328.72
  6. Step 6: Final answer
    x = 293.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.