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Finding the Fourth Proportional to 128.94, 192.17 and 125.20

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Solution

The fourth proportional to 128.94, 192.17 and 125.20 is: 186.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.94 : 192.17 = 125.20 : x
  2. Step 2: Convert to fraction form
    128.94/192.17 = 125.20/x
  3. Step 3: Cross multiply
    128.94x = 192.17 × 125.20
  4. Step 4: Simplify right side
    128.94x = 24,059.16
  5. Step 5: Solve for x
    x = 24,059.16/128.94
  6. Step 6: Final answer
    x = 186.59

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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.