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Finding the Fourth Proportional to 189.89, 285.88 and 129.41

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Solution

The fourth proportional to 189.89, 285.88 and 129.41 is: 194.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.89 : 285.88 = 129.41 : x
  2. Step 2: Convert to fraction form
    189.89/285.88 = 129.41/x
  3. Step 3: Cross multiply
    189.89x = 285.88 × 129.41
  4. Step 4: Simplify right side
    189.89x = 36,995.69
  5. Step 5: Solve for x
    x = 36,995.69/189.89
  6. Step 6: Final answer
    x = 194.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.