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Finding the Fourth Proportional to 138, 190.35 and 88.25

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Solution

The fourth proportional to 138, 190.35 and 88.25 is: 121.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138 : 190.35 = 88.25 : x
  2. Step 2: Convert to fraction form
    138/190.35 = 88.25/x
  3. Step 3: Cross multiply
    138x = 190.35 × 88.25
  4. Step 4: Simplify right side
    138x = 16,797.44
  5. Step 5: Solve for x
    x = 16,797.44/138
  6. Step 6: Final answer
    x = 121.72

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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.