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Finding the Fourth Proportional to 208.61, 313.19 and 112.49

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Solution

The fourth proportional to 208.61, 313.19 and 112.49 is: 168.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.61 : 313.19 = 112.49 : x
  2. Step 2: Convert to fraction form
    208.61/313.19 = 112.49/x
  3. Step 3: Cross multiply
    208.61x = 313.19 × 112.49
  4. Step 4: Simplify right side
    208.61x = 35,230.18
  5. Step 5: Solve for x
    x = 35,230.18/208.61
  6. Step 6: Final answer
    x = 168.88

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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.