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Finding the Fourth Proportional to 128.26, 192.39 and 67.42

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Solution

The fourth proportional to 128.26, 192.39 and 67.42 is: 101.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.26 : 192.39 = 67.42 : x
  2. Step 2: Convert to fraction form
    128.26/192.39 = 67.42/x
  3. Step 3: Cross multiply
    128.26x = 192.39 × 67.42
  4. Step 4: Simplify right side
    128.26x = 12,970.93
  5. Step 5: Solve for x
    x = 12,970.93/128.26
  6. Step 6: Final answer
    x = 101.13

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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.