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Finding the Fourth Proportional to 153.97, 212.43 and 122.79

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Solution

The fourth proportional to 153.97, 212.43 and 122.79 is: 169.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.97 : 212.43 = 122.79 : x
  2. Step 2: Convert to fraction form
    153.97/212.43 = 122.79/x
  3. Step 3: Cross multiply
    153.97x = 212.43 × 122.79
  4. Step 4: Simplify right side
    153.97x = 26,084.28
  5. Step 5: Solve for x
    x = 26,084.28/153.97
  6. Step 6: Final answer
    x = 169.41

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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.