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Finding the Fourth Proportional to 208.67, 312.63 and 186.41

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Solution

The fourth proportional to 208.67, 312.63 and 186.41 is: 279.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.67 : 312.63 = 186.41 : x
  2. Step 2: Convert to fraction form
    208.67/312.63 = 186.41/x
  3. Step 3: Cross multiply
    208.67x = 312.63 × 186.41
  4. Step 4: Simplify right side
    208.67x = 58,277.36
  5. Step 5: Solve for x
    x = 58,277.36/208.67
  6. Step 6: Final answer
    x = 279.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.