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Finding the Fourth Proportional to 128.58, 178.28 and 124.44

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Solution

The fourth proportional to 128.58, 178.28 and 124.44 is: 172.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.58 : 178.28 = 124.44 : x
  2. Step 2: Convert to fraction form
    128.58/178.28 = 124.44/x
  3. Step 3: Cross multiply
    128.58x = 178.28 × 124.44
  4. Step 4: Simplify right side
    128.58x = 22,185.16
  5. Step 5: Solve for x
    x = 22,185.16/128.58
  6. Step 6: Final answer
    x = 172.54

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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.