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Finding the Fourth Proportional to 419.70, 579.20 and 253.97

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Solution

The fourth proportional to 419.70, 579.20 and 253.97 is: 350.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.70 : 579.20 = 253.97 : x
  2. Step 2: Convert to fraction form
    419.70/579.20 = 253.97/x
  3. Step 3: Cross multiply
    419.70x = 579.20 × 253.97
  4. Step 4: Simplify right side
    419.70x = 147,099.42
  5. Step 5: Solve for x
    x = 147,099.42/419.70
  6. Step 6: Final answer
    x = 350.49

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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.