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Finding the Fourth Proportional to 419.94, 579.42 and 245.28

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Solution

The fourth proportional to 419.94, 579.42 and 245.28 is: 338.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.94 : 579.42 = 245.28 : x
  2. Step 2: Convert to fraction form
    419.94/579.42 = 245.28/x
  3. Step 3: Cross multiply
    419.94x = 579.42 × 245.28
  4. Step 4: Simplify right side
    419.94x = 142,120.14
  5. Step 5: Solve for x
    x = 142,120.14/419.94
  6. Step 6: Final answer
    x = 338.43

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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.