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Finding the Fourth Proportional to 328.78, 453.26 and 223.70

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Solution

The fourth proportional to 328.78, 453.26 and 223.70 is: 308.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 453.26 = 223.70 : x
  2. Step 2: Convert to fraction form
    328.78/453.26 = 223.70/x
  3. Step 3: Cross multiply
    328.78x = 453.26 × 223.70
  4. Step 4: Simplify right side
    328.78x = 101,394.28
  5. Step 5: Solve for x
    x = 101,394.28/328.78
  6. Step 6: Final answer
    x = 308.40

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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.