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Finding the Fourth Proportional to 419.78, 579.30 and 253.94

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Solution

The fourth proportional to 419.78, 579.30 and 253.94 is: 350.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.78 : 579.30 = 253.94 : x
  2. Step 2: Convert to fraction form
    419.78/579.30 = 253.94/x
  3. Step 3: Cross multiply
    419.78x = 579.30 × 253.94
  4. Step 4: Simplify right side
    419.78x = 147,107.44
  5. Step 5: Solve for x
    x = 147,107.44/419.78
  6. Step 6: Final answer
    x = 350.44

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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.