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Finding the Fourth Proportional to 412.36, 618.54 and 220.39

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Solution

The fourth proportional to 412.36, 618.54 and 220.39 is: 330.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.36 : 618.54 = 220.39 : x
  2. Step 2: Convert to fraction form
    412.36/618.54 = 220.39/x
  3. Step 3: Cross multiply
    412.36x = 618.54 × 220.39
  4. Step 4: Simplify right side
    412.36x = 136,320.03
  5. Step 5: Solve for x
    x = 136,320.03/412.36
  6. Step 6: Final answer
    x = 330.59

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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.