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Finding the Fourth Proportional to 189.18, 283.68 and 112.31

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Solution

The fourth proportional to 189.18, 283.68 and 112.31 is: 168.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.18 : 283.68 = 112.31 : x
  2. Step 2: Convert to fraction form
    189.18/283.68 = 112.31/x
  3. Step 3: Cross multiply
    189.18x = 283.68 × 112.31
  4. Step 4: Simplify right side
    189.18x = 31,858.68
  5. Step 5: Solve for x
    x = 31,858.68/189.18
  6. Step 6: Final answer
    x = 168.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.