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Finding the Fourth Proportional to 128.96, 194.59 and 123.96

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Solution

The fourth proportional to 128.96, 194.59 and 123.96 is: 187.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.96 : 194.59 = 123.96 : x
  2. Step 2: Convert to fraction form
    128.96/194.59 = 123.96/x
  3. Step 3: Cross multiply
    128.96x = 194.59 × 123.96
  4. Step 4: Simplify right side
    128.96x = 24,121.38
  5. Step 5: Solve for x
    x = 24,121.38/128.96
  6. Step 6: Final answer
    x = 187.05

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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.