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Finding the Fourth Proportional to 366.21, 505.35 and 208.80

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Solution

The fourth proportional to 366.21, 505.35 and 208.80 is: 288.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    366.21 : 505.35 = 208.80 : x
  2. Step 2: Convert to fraction form
    366.21/505.35 = 208.80/x
  3. Step 3: Cross multiply
    366.21x = 505.35 × 208.80
  4. Step 4: Simplify right side
    366.21x = 105,517.08
  5. Step 5: Solve for x
    x = 105,517.08/366.21
  6. Step 6: Final answer
    x = 288.13

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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.