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Finding the Fourth Proportional to 208.11, 287.18 and 113.58

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Solution

The fourth proportional to 208.11, 287.18 and 113.58 is: 156.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.11 : 287.18 = 113.58 : x
  2. Step 2: Convert to fraction form
    208.11/287.18 = 113.58/x
  3. Step 3: Cross multiply
    208.11x = 287.18 × 113.58
  4. Step 4: Simplify right side
    208.11x = 32,617.90
  5. Step 5: Solve for x
    x = 32,617.90/208.11
  6. Step 6: Final answer
    x = 156.73

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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.