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Finding the Fourth Proportional to 318.61, 439.66 and 194.28

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Solution

The fourth proportional to 318.61, 439.66 and 194.28 is: 268.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.61 : 439.66 = 194.28 : x
  2. Step 2: Convert to fraction form
    318.61/439.66 = 194.28/x
  3. Step 3: Cross multiply
    318.61x = 439.66 × 194.28
  4. Step 4: Simplify right side
    318.61x = 85,415.74
  5. Step 5: Solve for x
    x = 85,415.74/318.61
  6. Step 6: Final answer
    x = 268.09

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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.