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Finding the Fourth Proportional to 419.90, 579.42 and 303.64

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Solution

The fourth proportional to 419.90, 579.42 and 303.64 is: 418.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.90 : 579.42 = 303.64 : x
  2. Step 2: Convert to fraction form
    419.90/579.42 = 303.64/x
  3. Step 3: Cross multiply
    419.90x = 579.42 × 303.64
  4. Step 4: Simplify right side
    419.90x = 175,935.09
  5. Step 5: Solve for x
    x = 175,935.09/419.90
  6. Step 6: Final answer
    x = 418.99

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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.