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Finding the Fourth Proportional to 208.41, 287.67 and 138.51

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Solution

The fourth proportional to 208.41, 287.67 and 138.51 is: 191.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.41 : 287.67 = 138.51 : x
  2. Step 2: Convert to fraction form
    208.41/287.67 = 138.51/x
  3. Step 3: Cross multiply
    208.41x = 287.67 × 138.51
  4. Step 4: Simplify right side
    208.41x = 39,845.17
  5. Step 5: Solve for x
    x = 39,845.17/208.41
  6. Step 6: Final answer
    x = 191.19

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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.