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Finding the Fourth Proportional to 128.07, 190.56 and 125.25

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Solution

The fourth proportional to 128.07, 190.56 and 125.25 is: 186.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.07 : 190.56 = 125.25 : x
  2. Step 2: Convert to fraction form
    128.07/190.56 = 125.25/x
  3. Step 3: Cross multiply
    128.07x = 190.56 × 125.25
  4. Step 4: Simplify right side
    128.07x = 23,867.64
  5. Step 5: Solve for x
    x = 23,867.64/128.07
  6. Step 6: Final answer
    x = 186.36

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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.