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Finding the Fourth Proportional to 128.19, 192.49 and 127.25

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Solution

The fourth proportional to 128.19, 192.49 and 127.25 is: 191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.19 : 192.49 = 127.25 : x
  2. Step 2: Convert to fraction form
    128.19/192.49 = 127.25/x
  3. Step 3: Cross multiply
    128.19x = 192.49 × 127.25
  4. Step 4: Simplify right side
    128.19x = 24,494.35
  5. Step 5: Solve for x
    x = 24,494.35/128.19
  6. Step 6: Final answer
    x = 191.08

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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.