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Finding the Fourth Proportional to 128.22, 191.15 and 124.35

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Solution

The fourth proportional to 128.22, 191.15 and 124.35 is: 185.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.22 : 191.15 = 124.35 : x
  2. Step 2: Convert to fraction form
    128.22/191.15 = 124.35/x
  3. Step 3: Cross multiply
    128.22x = 191.15 × 124.35
  4. Step 4: Simplify right side
    128.22x = 23,768.88
  5. Step 5: Solve for x
    x = 23,768.88/128.22
  6. Step 6: Final answer
    x = 185.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.