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Finding the Fourth Proportional to 189.21, 283.81 and 81.07

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Solution

The fourth proportional to 189.21, 283.81 and 81.07 is: 121.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.21 : 283.81 = 81.07 : x
  2. Step 2: Convert to fraction form
    189.21/283.81 = 81.07/x
  3. Step 3: Cross multiply
    189.21x = 283.81 × 81.07
  4. Step 4: Simplify right side
    189.21x = 23,008.48
  5. Step 5: Solve for x
    x = 23,008.48/189.21
  6. Step 6: Final answer
    x = 121.60

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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.