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Finding the Fourth Proportional to 189.20, 283.50 and 120.87

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Solution

The fourth proportional to 189.20, 283.50 and 120.87 is: 181.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.20 : 283.50 = 120.87 : x
  2. Step 2: Convert to fraction form
    189.20/283.50 = 120.87/x
  3. Step 3: Cross multiply
    189.20x = 283.50 × 120.87
  4. Step 4: Simplify right side
    189.20x = 34,266.65
  5. Step 5: Solve for x
    x = 34,266.65/189.20
  6. Step 6: Final answer
    x = 181.11

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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.