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Finding the Fourth Proportional to 189.92, 261.20 and 153

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Solution

The fourth proportional to 189.92, 261.20 and 153 is: 210.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.92 : 261.20 = 153 : x
  2. Step 2: Convert to fraction form
    189.92/261.20 = 153/x
  3. Step 3: Cross multiply
    189.92x = 261.20 × 153
  4. Step 4: Simplify right side
    189.92x = 39,963.60
  5. Step 5: Solve for x
    x = 39,963.60/189.92
  6. Step 6: Final answer
    x = 210.42

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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.