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Finding the Fourth Proportional to 319.64, 440.94 and 201.55

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Solution

The fourth proportional to 319.64, 440.94 and 201.55 is: 278.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.64 : 440.94 = 201.55 : x
  2. Step 2: Convert to fraction form
    319.64/440.94 = 201.55/x
  3. Step 3: Cross multiply
    319.64x = 440.94 × 201.55
  4. Step 4: Simplify right side
    319.64x = 88,870.45
  5. Step 5: Solve for x
    x = 88,870.45/319.64
  6. Step 6: Final answer
    x = 278.03

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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.