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Finding the Fourth Proportional to 208.31, 287.57 and 120.97

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Solution

The fourth proportional to 208.31, 287.57 and 120.97 is: 167.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.31 : 287.57 = 120.97 : x
  2. Step 2: Convert to fraction form
    208.31/287.57 = 120.97/x
  3. Step 3: Cross multiply
    208.31x = 287.57 × 120.97
  4. Step 4: Simplify right side
    208.31x = 34,787.34
  5. Step 5: Solve for x
    x = 34,787.34/208.31
  6. Step 6: Final answer
    x = 167.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.