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Finding the Fourth Proportional to 418.18, 576.30 and 399.28

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Solution

The fourth proportional to 418.18, 576.30 and 399.28 is: 550.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.18 : 576.30 = 399.28 : x
  2. Step 2: Convert to fraction form
    418.18/576.30 = 399.28/x
  3. Step 3: Cross multiply
    418.18x = 576.30 × 399.28
  4. Step 4: Simplify right side
    418.18x = 230,105.06
  5. Step 5: Solve for x
    x = 230,105.06/418.18
  6. Step 6: Final answer
    x = 550.25

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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.