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Finding the Fourth Proportional to 208.29, 312.60 and 110.85

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Solution

The fourth proportional to 208.29, 312.60 and 110.85 is: 166.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.29 : 312.60 = 110.85 : x
  2. Step 2: Convert to fraction form
    208.29/312.60 = 110.85/x
  3. Step 3: Cross multiply
    208.29x = 312.60 × 110.85
  4. Step 4: Simplify right side
    208.29x = 34,651.71
  5. Step 5: Solve for x
    x = 34,651.71/208.29
  6. Step 6: Final answer
    x = 166.36

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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.