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Finding the Fourth Proportional to 137.80, 189.97 and 94.06

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Solution

The fourth proportional to 137.80, 189.97 and 94.06 is: 129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.80 : 189.97 = 94.06 : x
  2. Step 2: Convert to fraction form
    137.80/189.97 = 94.06/x
  3. Step 3: Cross multiply
    137.80x = 189.97 × 94.06
  4. Step 4: Simplify right side
    137.80x = 17,868.58
  5. Step 5: Solve for x
    x = 17,868.58/137.80
  6. Step 6: Final answer
    x = 129.67

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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.