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Finding the Fourth Proportional to 128.25, 192.07 and 92.00

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Solution

The fourth proportional to 128.25, 192.07 and 92.00 is: 137.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 192.07 = 92.00 : x
  2. Step 2: Convert to fraction form
    128.25/192.07 = 92.00/x
  3. Step 3: Cross multiply
    128.25x = 192.07 × 92.00
  4. Step 4: Simplify right side
    128.25x = 17,671.04
  5. Step 5: Solve for x
    x = 17,671.04/128.25
  6. Step 6: Final answer
    x = 137.79

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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.