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Finding the Fourth Proportional to 128.14, 192.06 and 84.30

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Solution

The fourth proportional to 128.14, 192.06 and 84.30 is: 126.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.14 : 192.06 = 84.30 : x
  2. Step 2: Convert to fraction form
    128.14/192.06 = 84.30/x
  3. Step 3: Cross multiply
    128.14x = 192.06 × 84.30
  4. Step 4: Simplify right side
    128.14x = 16,190.66
  5. Step 5: Solve for x
    x = 16,190.66/128.14
  6. Step 6: Final answer
    x = 126.35

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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.