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Finding the Fourth Proportional to 128.85, 191.74 and 125.94

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Solution

The fourth proportional to 128.85, 191.74 and 125.94 is: 187.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.85 : 191.74 = 125.94 : x
  2. Step 2: Convert to fraction form
    128.85/191.74 = 125.94/x
  3. Step 3: Cross multiply
    128.85x = 191.74 × 125.94
  4. Step 4: Simplify right side
    128.85x = 24,147.74
  5. Step 5: Solve for x
    x = 24,147.74/128.85
  6. Step 6: Final answer
    x = 187.41

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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.