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Finding the Fourth Proportional to 128.24, 192.39 and 56.12

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Solution

The fourth proportional to 128.24, 192.39 and 56.12 is: 84.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.24 : 192.39 = 56.12 : x
  2. Step 2: Convert to fraction form
    128.24/192.39 = 56.12/x
  3. Step 3: Cross multiply
    128.24x = 192.39 × 56.12
  4. Step 4: Simplify right side
    128.24x = 10,796.93
  5. Step 5: Solve for x
    x = 10,796.93/128.24
  6. Step 6: Final answer
    x = 84.19

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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.