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Finding the Fourth Proportional to 208.68, 312.60 and 162.80

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Solution

The fourth proportional to 208.68, 312.60 and 162.80 is: 243.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.68 : 312.60 = 162.80 : x
  2. Step 2: Convert to fraction form
    208.68/312.60 = 162.80/x
  3. Step 3: Cross multiply
    208.68x = 312.60 × 162.80
  4. Step 4: Simplify right side
    208.68x = 50,891.28
  5. Step 5: Solve for x
    x = 50,891.28/208.68
  6. Step 6: Final answer
    x = 243.87

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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.