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Finding the Fourth Proportional to 208.12, 312.30 and 111.96

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Solution

The fourth proportional to 208.12, 312.30 and 111.96 is: 168.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.12 : 312.30 = 111.96 : x
  2. Step 2: Convert to fraction form
    208.12/312.30 = 111.96/x
  3. Step 3: Cross multiply
    208.12x = 312.30 × 111.96
  4. Step 4: Simplify right side
    208.12x = 34,965.11
  5. Step 5: Solve for x
    x = 34,965.11/208.12
  6. Step 6: Final answer
    x = 168.00

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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.