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Finding the Fourth Proportional to 128.44, 191.89 and 125.56

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Solution

The fourth proportional to 128.44, 191.89 and 125.56 is: 187.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.44 : 191.89 = 125.56 : x
  2. Step 2: Convert to fraction form
    128.44/191.89 = 125.56/x
  3. Step 3: Cross multiply
    128.44x = 191.89 × 125.56
  4. Step 4: Simplify right side
    128.44x = 24,093.71
  5. Step 5: Solve for x
    x = 24,093.71/128.44
  6. Step 6: Final answer
    x = 187.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.