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Finding the Fourth Proportional to 208.09, 312.24 and 92.48

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Solution

The fourth proportional to 208.09, 312.24 and 92.48 is: 138.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.09 : 312.24 = 92.48 : x
  2. Step 2: Convert to fraction form
    208.09/312.24 = 92.48/x
  3. Step 3: Cross multiply
    208.09x = 312.24 × 92.48
  4. Step 4: Simplify right side
    208.09x = 28,875.96
  5. Step 5: Solve for x
    x = 28,875.96/208.09
  6. Step 6: Final answer
    x = 138.77

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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.