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Finding the Fourth Proportional to 189.78, 284.41 and 159.37

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Solution

The fourth proportional to 189.78, 284.41 and 159.37 is: 238.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.78 : 284.41 = 159.37 : x
  2. Step 2: Convert to fraction form
    189.78/284.41 = 159.37/x
  3. Step 3: Cross multiply
    189.78x = 284.41 × 159.37
  4. Step 4: Simplify right side
    189.78x = 45,325.91
  5. Step 5: Solve for x
    x = 45,325.91/189.78
  6. Step 6: Final answer
    x = 238.84

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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.