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Finding the Fourth Proportional to 138.84, 206.79 and 138.15

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Solution

The fourth proportional to 138.84, 206.79 and 138.15 is: 205.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.84 : 206.79 = 138.15 : x
  2. Step 2: Convert to fraction form
    138.84/206.79 = 138.15/x
  3. Step 3: Cross multiply
    138.84x = 206.79 × 138.15
  4. Step 4: Simplify right side
    138.84x = 28,568.04
  5. Step 5: Solve for x
    x = 28,568.04/138.84
  6. Step 6: Final answer
    x = 205.76

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.