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Finding the Fourth Proportional to 208.58, 311.31 and 186.71

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Solution

The fourth proportional to 208.58, 311.31 and 186.71 is: 278.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.58 : 311.31 = 186.71 : x
  2. Step 2: Convert to fraction form
    208.58/311.31 = 186.71/x
  3. Step 3: Cross multiply
    208.58x = 311.31 × 186.71
  4. Step 4: Simplify right side
    208.58x = 58,123.13
  5. Step 5: Solve for x
    x = 58,123.13/208.58
  6. Step 6: Final answer
    x = 278.67

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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.