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Finding the Fourth Proportional to 154.35, 212.36 and 142.83

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Solution

The fourth proportional to 154.35, 212.36 and 142.83 is: 196.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.35 : 212.36 = 142.83 : x
  2. Step 2: Convert to fraction form
    154.35/212.36 = 142.83/x
  3. Step 3: Cross multiply
    154.35x = 212.36 × 142.83
  4. Step 4: Simplify right side
    154.35x = 30,330.66
  5. Step 5: Solve for x
    x = 30,330.66/154.35
  6. Step 6: Final answer
    x = 196.51

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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.