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Finding the Fourth Proportional to 154.40, 212.92 and 136.92

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Solution

The fourth proportional to 154.40, 212.92 and 136.92 is: 188.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.40 : 212.92 = 136.92 : x
  2. Step 2: Convert to fraction form
    154.40/212.92 = 136.92/x
  3. Step 3: Cross multiply
    154.40x = 212.92 × 136.92
  4. Step 4: Simplify right side
    154.40x = 29,153.01
  5. Step 5: Solve for x
    x = 29,153.01/154.40
  6. Step 6: Final answer
    x = 188.81

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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.