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Finding the Fourth Proportional to 154.19, 212.83 and 138.63

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Solution

The fourth proportional to 154.19, 212.83 and 138.63 is: 191.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.19 : 212.83 = 138.63 : x
  2. Step 2: Convert to fraction form
    154.19/212.83 = 138.63/x
  3. Step 3: Cross multiply
    154.19x = 212.83 × 138.63
  4. Step 4: Simplify right side
    154.19x = 29,504.62
  5. Step 5: Solve for x
    x = 29,504.62/154.19
  6. Step 6: Final answer
    x = 191.35

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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.