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Finding the Fourth Proportional to 328.62, 453.70 and 218.20

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Solution

The fourth proportional to 328.62, 453.70 and 218.20 is: 301.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.62 : 453.70 = 218.20 : x
  2. Step 2: Convert to fraction form
    328.62/453.70 = 218.20/x
  3. Step 3: Cross multiply
    328.62x = 453.70 × 218.20
  4. Step 4: Simplify right side
    328.62x = 98,997.34
  5. Step 5: Solve for x
    x = 98,997.34/328.62
  6. Step 6: Final answer
    x = 301.25

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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.