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Finding the Fourth Proportional to 403.36, 605.60 and 385.92

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Solution

The fourth proportional to 403.36, 605.60 and 385.92 is: 579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.36 : 605.60 = 385.92 : x
  2. Step 2: Convert to fraction form
    403.36/605.60 = 385.92/x
  3. Step 3: Cross multiply
    403.36x = 605.60 × 385.92
  4. Step 4: Simplify right side
    403.36x = 233,713.15
  5. Step 5: Solve for x
    x = 233,713.15/403.36
  6. Step 6: Final answer
    x = 579.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.