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Finding the Fourth Proportional to 208.54, 312.96 and 86.82

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Solution

The fourth proportional to 208.54, 312.96 and 86.82 is: 130.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.54 : 312.96 = 86.82 : x
  2. Step 2: Convert to fraction form
    208.54/312.96 = 86.82/x
  3. Step 3: Cross multiply
    208.54x = 312.96 × 86.82
  4. Step 4: Simplify right side
    208.54x = 27,171.19
  5. Step 5: Solve for x
    x = 27,171.19/208.54
  6. Step 6: Final answer
    x = 130.29

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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.