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Finding the Fourth Proportional to 189.56, 284.39 and 86.79

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Solution

The fourth proportional to 189.56, 284.39 and 86.79 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.56 : 284.39 = 86.79 : x
  2. Step 2: Convert to fraction form
    189.56/284.39 = 86.79/x
  3. Step 3: Cross multiply
    189.56x = 284.39 × 86.79
  4. Step 4: Simplify right side
    189.56x = 24,682.21
  5. Step 5: Solve for x
    x = 24,682.21/189.56
  6. Step 6: Final answer
    x = 130.21

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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.