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Finding the Fourth Proportional to 328.90, 454.11 and 218.60

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Solution

The fourth proportional to 328.90, 454.11 and 218.60 is: 301.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.90 : 454.11 = 218.60 : x
  2. Step 2: Convert to fraction form
    328.90/454.11 = 218.60/x
  3. Step 3: Cross multiply
    328.90x = 454.11 × 218.60
  4. Step 4: Simplify right side
    328.90x = 99,268.45
  5. Step 5: Solve for x
    x = 99,268.45/328.90
  6. Step 6: Final answer
    x = 301.82

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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.