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Finding the Fourth Proportional to 154.28, 212.92 and 92.12

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Solution

The fourth proportional to 154.28, 212.92 and 92.12 is: 127.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.28 : 212.92 = 92.12 : x
  2. Step 2: Convert to fraction form
    154.28/212.92 = 92.12/x
  3. Step 3: Cross multiply
    154.28x = 212.92 × 92.12
  4. Step 4: Simplify right side
    154.28x = 19,614.49
  5. Step 5: Solve for x
    x = 19,614.49/154.28
  6. Step 6: Final answer
    x = 127.13

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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.