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Finding the Fourth Proportional to 208.86, 313.08 and 131.76

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Solution

The fourth proportional to 208.86, 313.08 and 131.76 is: 197.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.86 : 313.08 = 131.76 : x
  2. Step 2: Convert to fraction form
    208.86/313.08 = 131.76/x
  3. Step 3: Cross multiply
    208.86x = 313.08 × 131.76
  4. Step 4: Simplify right side
    208.86x = 41,251.42
  5. Step 5: Solve for x
    x = 41,251.42/208.86
  6. Step 6: Final answer
    x = 197.51

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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.