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Finding the Fourth Proportional to 154.23, 212.70 and 138.63

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Solution

The fourth proportional to 154.23, 212.70 and 138.63 is: 191.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.23 : 212.70 = 138.63 : x
  2. Step 2: Convert to fraction form
    154.23/212.70 = 138.63/x
  3. Step 3: Cross multiply
    154.23x = 212.70 × 138.63
  4. Step 4: Simplify right side
    154.23x = 29,486.60
  5. Step 5: Solve for x
    x = 29,486.60/154.23
  6. Step 6: Final answer
    x = 191.19

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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.