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Finding the Fourth Proportional to 208.84, 288.27 and 138.88

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Solution

The fourth proportional to 208.84, 288.27 and 138.88 is: 191.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.84 : 288.27 = 138.88 : x
  2. Step 2: Convert to fraction form
    208.84/288.27 = 138.88/x
  3. Step 3: Cross multiply
    208.84x = 288.27 × 138.88
  4. Step 4: Simplify right side
    208.84x = 40,034.94
  5. Step 5: Solve for x
    x = 40,034.94/208.84
  6. Step 6: Final answer
    x = 191.70

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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.