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Finding the Fourth Proportional to 328.85, 453.91 and 212.39

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Solution

The fourth proportional to 328.85, 453.91 and 212.39 is: 293.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.85 : 453.91 = 212.39 : x
  2. Step 2: Convert to fraction form
    328.85/453.91 = 212.39/x
  3. Step 3: Cross multiply
    328.85x = 453.91 × 212.39
  4. Step 4: Simplify right side
    328.85x = 96,403.14
  5. Step 5: Solve for x
    x = 96,403.14/328.85
  6. Step 6: Final answer
    x = 293.16

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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.