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Finding the Fourth Proportional to 189.45, 261.42 and 106.55

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Solution

The fourth proportional to 189.45, 261.42 and 106.55 is: 147.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.45 : 261.42 = 106.55 : x
  2. Step 2: Convert to fraction form
    189.45/261.42 = 106.55/x
  3. Step 3: Cross multiply
    189.45x = 261.42 × 106.55
  4. Step 4: Simplify right side
    189.45x = 27,852.99
  5. Step 5: Solve for x
    x = 27,852.99/189.45
  6. Step 6: Final answer
    x = 147.02

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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.