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Finding the Fourth Proportional to 138.70, 206.62 and 134.45

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Solution

The fourth proportional to 138.70, 206.62 and 134.45 is: 200.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.70 : 206.62 = 134.45 : x
  2. Step 2: Convert to fraction form
    138.70/206.62 = 134.45/x
  3. Step 3: Cross multiply
    138.70x = 206.62 × 134.45
  4. Step 4: Simplify right side
    138.70x = 27,780.06
  5. Step 5: Solve for x
    x = 27,780.06/138.70
  6. Step 6: Final answer
    x = 200.29

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Why These Related Problems?

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