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Finding the Fourth Proportional to 319.81, 441.34 and 187.11

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Solution

The fourth proportional to 319.81, 441.34 and 187.11 is: 258.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.81 : 441.34 = 187.11 : x
  2. Step 2: Convert to fraction form
    319.81/441.34 = 187.11/x
  3. Step 3: Cross multiply
    319.81x = 441.34 × 187.11
  4. Step 4: Simplify right side
    319.81x = 82,578.40
  5. Step 5: Solve for x
    x = 82,578.40/319.81
  6. Step 6: Final answer
    x = 258.21

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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.