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Finding the Fourth Proportional to 318.84, 439.88 and 208.28

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Solution

The fourth proportional to 318.84, 439.88 and 208.28 is: 287.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.84 : 439.88 = 208.28 : x
  2. Step 2: Convert to fraction form
    318.84/439.88 = 208.28/x
  3. Step 3: Cross multiply
    318.84x = 439.88 × 208.28
  4. Step 4: Simplify right side
    318.84x = 91,618.21
  5. Step 5: Solve for x
    x = 91,618.21/318.84
  6. Step 6: Final answer
    x = 287.35

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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.