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Finding the Fourth Proportional to 189.25, 283.86 and 86.49

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Solution

The fourth proportional to 189.25, 283.86 and 86.49 is: 129.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.25 : 283.86 = 86.49 : x
  2. Step 2: Convert to fraction form
    189.25/283.86 = 86.49/x
  3. Step 3: Cross multiply
    189.25x = 283.86 × 86.49
  4. Step 4: Simplify right side
    189.25x = 24,551.05
  5. Step 5: Solve for x
    x = 24,551.05/189.25
  6. Step 6: Final answer
    x = 129.73

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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.