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Finding the Fourth Proportional to 328.90, 453.78 and 218.26

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Solution

The fourth proportional to 328.90, 453.78 and 218.26 is: 301.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.90 : 453.78 = 218.26 : x
  2. Step 2: Convert to fraction form
    328.90/453.78 = 218.26/x
  3. Step 3: Cross multiply
    328.90x = 453.78 × 218.26
  4. Step 4: Simplify right side
    328.90x = 99,042.02
  5. Step 5: Solve for x
    x = 99,042.02/328.90
  6. Step 6: Final answer
    x = 301.13

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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.