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Finding the Fourth Proportional to 128.31, 192.44 and 37

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Solution

The fourth proportional to 128.31, 192.44 and 37 is: 55.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.31 : 192.44 = 37 : x
  2. Step 2: Convert to fraction form
    128.31/192.44 = 37/x
  3. Step 3: Cross multiply
    128.31x = 192.44 × 37
  4. Step 4: Simplify right side
    128.31x = 7,120.28
  5. Step 5: Solve for x
    x = 7,120.28/128.31
  6. Step 6: Final answer
    x = 55.49

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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.