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Finding the Fourth Proportional to 153.98, 229.78 and 137.78

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Solution

The fourth proportional to 153.98, 229.78 and 137.78 is: 205.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.98 : 229.78 = 137.78 : x
  2. Step 2: Convert to fraction form
    153.98/229.78 = 137.78/x
  3. Step 3: Cross multiply
    153.98x = 229.78 × 137.78
  4. Step 4: Simplify right side
    153.98x = 31,659.09
  5. Step 5: Solve for x
    x = 31,659.09/153.98
  6. Step 6: Final answer
    x = 205.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.