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Finding the Fourth Proportional to 189.60, 284.22 and 140.72

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Solution

The fourth proportional to 189.60, 284.22 and 140.72 is: 210.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.60 : 284.22 = 140.72 : x
  2. Step 2: Convert to fraction form
    189.60/284.22 = 140.72/x
  3. Step 3: Cross multiply
    189.60x = 284.22 × 140.72
  4. Step 4: Simplify right side
    189.60x = 39,995.44
  5. Step 5: Solve for x
    x = 39,995.44/189.60
  6. Step 6: Final answer
    x = 210.95

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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.