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Finding the Fourth Proportional to 128.94, 178.76 and 126.43

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Solution

The fourth proportional to 128.94, 178.76 and 126.43 is: 175.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.94 : 178.76 = 126.43 : x
  2. Step 2: Convert to fraction form
    128.94/178.76 = 126.43/x
  3. Step 3: Cross multiply
    128.94x = 178.76 × 126.43
  4. Step 4: Simplify right side
    128.94x = 22,600.63
  5. Step 5: Solve for x
    x = 22,600.63/128.94
  6. Step 6: Final answer
    x = 175.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.