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Finding the Fourth Proportional to 419.99, 579.20 and 272.79

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Solution

The fourth proportional to 419.99, 579.20 and 272.79 is: 376.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.99 : 579.20 = 272.79 : x
  2. Step 2: Convert to fraction form
    419.99/579.20 = 272.79/x
  3. Step 3: Cross multiply
    419.99x = 579.20 × 272.79
  4. Step 4: Simplify right side
    419.99x = 157,998.60
  5. Step 5: Solve for x
    x = 157,998.60/419.99
  6. Step 6: Final answer
    x = 376.20

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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.