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Finding the Fourth Proportional to 126.72, 188.46 and 125.28

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Solution

The fourth proportional to 126.72, 188.46 and 125.28 is: 186.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.72 : 188.46 = 125.28 : x
  2. Step 2: Convert to fraction form
    126.72/188.46 = 125.28/x
  3. Step 3: Cross multiply
    126.72x = 188.46 × 125.28
  4. Step 4: Simplify right side
    126.72x = 23,610.27
  5. Step 5: Solve for x
    x = 23,610.27/126.72
  6. Step 6: Final answer
    x = 186.32

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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.