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Finding the Fourth Proportional to 128.56, 177.44 and 93.78

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Solution

The fourth proportional to 128.56, 177.44 and 93.78 is: 129.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.56 : 177.44 = 93.78 : x
  2. Step 2: Convert to fraction form
    128.56/177.44 = 93.78/x
  3. Step 3: Cross multiply
    128.56x = 177.44 × 93.78
  4. Step 4: Simplify right side
    128.56x = 16,640.32
  5. Step 5: Solve for x
    x = 16,640.32/128.56
  6. Step 6: Final answer
    x = 129.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.