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Finding the Fourth Proportional to 189.72, 282.22 and 189.12

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Solution

The fourth proportional to 189.72, 282.22 and 189.12 is: 281.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.72 : 282.22 = 189.12 : x
  2. Step 2: Convert to fraction form
    189.72/282.22 = 189.12/x
  3. Step 3: Cross multiply
    189.72x = 282.22 × 189.12
  4. Step 4: Simplify right side
    189.72x = 53,373.45
  5. Step 5: Solve for x
    x = 53,373.45/189.72
  6. Step 6: Final answer
    x = 281.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.