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Finding the Fourth Proportional to 295.70, 408.05 and 208.55

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Solution

The fourth proportional to 295.70, 408.05 and 208.55 is: 287.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    295.70 : 408.05 = 208.55 : x
  2. Step 2: Convert to fraction form
    295.70/408.05 = 208.55/x
  3. Step 3: Cross multiply
    295.70x = 408.05 × 208.55
  4. Step 4: Simplify right side
    295.70x = 85,095.74
  5. Step 5: Solve for x
    x = 85,095.74/295.70
  6. Step 6: Final answer
    x = 287.78

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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.