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Finding the Fourth Proportional to 208.12, 312.54 and 115.54

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Solution

The fourth proportional to 208.12, 312.54 and 115.54 is: 173.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.12 : 312.54 = 115.54 : x
  2. Step 2: Convert to fraction form
    208.12/312.54 = 115.54/x
  3. Step 3: Cross multiply
    208.12x = 312.54 × 115.54
  4. Step 4: Simplify right side
    208.12x = 36,110.87
  5. Step 5: Solve for x
    x = 36,110.87/208.12
  6. Step 6: Final answer
    x = 173.51

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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.