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Finding the Fourth Proportional to 128.44, 192.64 and 47.27

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Solution

The fourth proportional to 128.44, 192.64 and 47.27 is: 70.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.44 : 192.64 = 47.27 : x
  2. Step 2: Convert to fraction form
    128.44/192.64 = 47.27/x
  3. Step 3: Cross multiply
    128.44x = 192.64 × 47.27
  4. Step 4: Simplify right side
    128.44x = 9,105.01
  5. Step 5: Solve for x
    x = 9,105.01/128.44
  6. Step 6: Final answer
    x = 70.89

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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.