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Finding the Fourth Proportional to 319.77, 441.60 and 285.39

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Solution

The fourth proportional to 319.77, 441.60 and 285.39 is: 394.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.77 : 441.60 = 285.39 : x
  2. Step 2: Convert to fraction form
    319.77/441.60 = 285.39/x
  3. Step 3: Cross multiply
    319.77x = 441.60 × 285.39
  4. Step 4: Simplify right side
    319.77x = 126,028.22
  5. Step 5: Solve for x
    x = 126,028.22/319.77
  6. Step 6: Final answer
    x = 394.12

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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.