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Finding the Fourth Proportional to 299.30, 412.80 and 220.58

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Solution

The fourth proportional to 299.30, 412.80 and 220.58 is: 304.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.30 : 412.80 = 220.58 : x
  2. Step 2: Convert to fraction form
    299.30/412.80 = 220.58/x
  3. Step 3: Cross multiply
    299.30x = 412.80 × 220.58
  4. Step 4: Simplify right side
    299.30x = 91,053.36
  5. Step 5: Solve for x
    x = 91,053.36/299.30
  6. Step 6: Final answer
    x = 304.22

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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.