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Finding the Fourth Proportional to 208.20, 310.31 and 186.56

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Solution

The fourth proportional to 208.20, 310.31 and 186.56 is: 278.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.20 : 310.31 = 186.56 : x
  2. Step 2: Convert to fraction form
    208.20/310.31 = 186.56/x
  3. Step 3: Cross multiply
    208.20x = 310.31 × 186.56
  4. Step 4: Simplify right side
    208.20x = 57,890.35
  5. Step 5: Solve for x
    x = 57,890.35/208.20
  6. Step 6: Final answer
    x = 278.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.