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Finding the Fourth Proportional to 319.44, 440.52 and 257.16

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Solution

The fourth proportional to 319.44, 440.52 and 257.16 is: 354.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.44 : 440.52 = 257.16 : x
  2. Step 2: Convert to fraction form
    319.44/440.52 = 257.16/x
  3. Step 3: Cross multiply
    319.44x = 440.52 × 257.16
  4. Step 4: Simplify right side
    319.44x = 113,284.12
  5. Step 5: Solve for x
    x = 113,284.12/319.44
  6. Step 6: Final answer
    x = 354.63

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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.