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Finding the Fourth Proportional to 401.28, 602.20 and 218.76

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Solution

The fourth proportional to 401.28, 602.20 and 218.76 is: 328.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.28 : 602.20 = 218.76 : x
  2. Step 2: Convert to fraction form
    401.28/602.20 = 218.76/x
  3. Step 3: Cross multiply
    401.28x = 602.20 × 218.76
  4. Step 4: Simplify right side
    401.28x = 131,737.27
  5. Step 5: Solve for x
    x = 131,737.27/401.28
  6. Step 6: Final answer
    x = 328.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.