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Finding the Fourth Proportional to 128.10, 191.82 and 125.66

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Solution

The fourth proportional to 128.10, 191.82 and 125.66 is: 188.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.10 : 191.82 = 125.66 : x
  2. Step 2: Convert to fraction form
    128.10/191.82 = 125.66/x
  3. Step 3: Cross multiply
    128.10x = 191.82 × 125.66
  4. Step 4: Simplify right side
    128.10x = 24,104.10
  5. Step 5: Solve for x
    x = 24,104.10/128.10
  6. Step 6: Final answer
    x = 188.17

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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.