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Finding the Fourth Proportional to 319.19, 439.40 and 286.43

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Solution

The fourth proportional to 319.19, 439.40 and 286.43 is: 394.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.19 : 439.40 = 286.43 : x
  2. Step 2: Convert to fraction form
    319.19/439.40 = 286.43/x
  3. Step 3: Cross multiply
    319.19x = 439.40 × 286.43
  4. Step 4: Simplify right side
    319.19x = 125,855.53
  5. Step 5: Solve for x
    x = 125,855.53/319.19
  6. Step 6: Final answer
    x = 394.30

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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.