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Finding the Fourth Proportional to 128.27, 191.52 and 127.04

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Solution

The fourth proportional to 128.27, 191.52 and 127.04 is: 189.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.27 : 191.52 = 127.04 : x
  2. Step 2: Convert to fraction form
    128.27/191.52 = 127.04/x
  3. Step 3: Cross multiply
    128.27x = 191.52 × 127.04
  4. Step 4: Simplify right side
    128.27x = 24,330.70
  5. Step 5: Solve for x
    x = 24,330.70/128.27
  6. Step 6: Final answer
    x = 189.68

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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.