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Finding the Fourth Proportional to 319.31, 440.63 and 188.31

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Solution

The fourth proportional to 319.31, 440.63 and 188.31 is: 259.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.31 : 440.63 = 188.31 : x
  2. Step 2: Convert to fraction form
    319.31/440.63 = 188.31/x
  3. Step 3: Cross multiply
    319.31x = 440.63 × 188.31
  4. Step 4: Simplify right side
    319.31x = 82,974.09
  5. Step 5: Solve for x
    x = 82,974.09/319.31
  6. Step 6: Final answer
    x = 259.86

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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.