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Finding the Fourth Proportional to 208.68, 313.08 and 131.64

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Solution

The fourth proportional to 208.68, 313.08 and 131.64 is: 197.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.68 : 313.08 = 131.64 : x
  2. Step 2: Convert to fraction form
    208.68/313.08 = 131.64/x
  3. Step 3: Cross multiply
    208.68x = 313.08 × 131.64
  4. Step 4: Simplify right side
    208.68x = 41,213.85
  5. Step 5: Solve for x
    x = 41,213.85/208.68
  6. Step 6: Final answer
    x = 197.50

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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.