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Finding the Fourth Proportional to 128.28, 175.87 and 126.16

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Solution

The fourth proportional to 128.28, 175.87 and 126.16 is: 172.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.28 : 175.87 = 126.16 : x
  2. Step 2: Convert to fraction form
    128.28/175.87 = 126.16/x
  3. Step 3: Cross multiply
    128.28x = 175.87 × 126.16
  4. Step 4: Simplify right side
    128.28x = 22,187.48
  5. Step 5: Solve for x
    x = 22,187.48/128.28
  6. Step 6: Final answer
    x = 172.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.