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Finding the Fourth Proportional to 348.40, 480.78 and 208.49

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Solution

The fourth proportional to 348.40, 480.78 and 208.49 is: 287.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.40 : 480.78 = 208.49 : x
  2. Step 2: Convert to fraction form
    348.40/480.78 = 208.49/x
  3. Step 3: Cross multiply
    348.40x = 480.78 × 208.49
  4. Step 4: Simplify right side
    348.40x = 100,234.64
  5. Step 5: Solve for x
    x = 100,234.64/348.40
  6. Step 6: Final answer
    x = 287.70

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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.