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Finding the Fourth Proportional to 154.29, 212.79 and 142.55

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Solution

The fourth proportional to 154.29, 212.79 and 142.55 is: 196.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.29 : 212.79 = 142.55 : x
  2. Step 2: Convert to fraction form
    154.29/212.79 = 142.55/x
  3. Step 3: Cross multiply
    154.29x = 212.79 × 142.55
  4. Step 4: Simplify right side
    154.29x = 30,333.21
  5. Step 5: Solve for x
    x = 30,333.21/154.29
  6. Step 6: Final answer
    x = 196.60

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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.