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Finding the Fourth Proportional to 138.84, 208.02 and 102.84

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Solution

The fourth proportional to 138.84, 208.02 and 102.84 is: 154.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.84 : 208.02 = 102.84 : x
  2. Step 2: Convert to fraction form
    138.84/208.02 = 102.84/x
  3. Step 3: Cross multiply
    138.84x = 208.02 × 102.84
  4. Step 4: Simplify right side
    138.84x = 21,392.78
  5. Step 5: Solve for x
    x = 21,392.78/138.84
  6. Step 6: Final answer
    x = 154.08

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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.