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Finding the Fourth Proportional to 189.90, 285.03 and 80.28

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Solution

The fourth proportional to 189.90, 285.03 and 80.28 is: 120.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.90 : 285.03 = 80.28 : x
  2. Step 2: Convert to fraction form
    189.90/285.03 = 80.28/x
  3. Step 3: Cross multiply
    189.90x = 285.03 × 80.28
  4. Step 4: Simplify right side
    189.90x = 22,882.21
  5. Step 5: Solve for x
    x = 22,882.21/189.90
  6. Step 6: Final answer
    x = 120.50

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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.