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Finding the Fourth Proportional to 128.90, 193.14 and 124.44

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Solution

The fourth proportional to 128.90, 193.14 and 124.44 is: 186.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.90 : 193.14 = 124.44 : x
  2. Step 2: Convert to fraction form
    128.90/193.14 = 124.44/x
  3. Step 3: Cross multiply
    128.90x = 193.14 × 124.44
  4. Step 4: Simplify right side
    128.90x = 24,033.72
  5. Step 5: Solve for x
    x = 24,033.72/128.90
  6. Step 6: Final answer
    x = 186.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.