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Finding the Fourth Proportional to 318.94, 439.05 and 286.18

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Solution

The fourth proportional to 318.94, 439.05 and 286.18 is: 393.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.94 : 439.05 = 286.18 : x
  2. Step 2: Convert to fraction form
    318.94/439.05 = 286.18/x
  3. Step 3: Cross multiply
    318.94x = 439.05 × 286.18
  4. Step 4: Simplify right side
    318.94x = 125,647.30
  5. Step 5: Solve for x
    x = 125,647.30/318.94
  6. Step 6: Final answer
    x = 393.96

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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.