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Finding the Fourth Proportional to 189.21, 261.06 and 106.30

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Solution

The fourth proportional to 189.21, 261.06 and 106.30 is: 146.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.21 : 261.06 = 106.30 : x
  2. Step 2: Convert to fraction form
    189.21/261.06 = 106.30/x
  3. Step 3: Cross multiply
    189.21x = 261.06 × 106.30
  4. Step 4: Simplify right side
    189.21x = 27,750.68
  5. Step 5: Solve for x
    x = 27,750.68/189.21
  6. Step 6: Final answer
    x = 146.67

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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.