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Finding the Fourth Proportional to 128.17, 192.19 and 56

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Solution

The fourth proportional to 128.17, 192.19 and 56 is: 83.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.17 : 192.19 = 56 : x
  2. Step 2: Convert to fraction form
    128.17/192.19 = 56/x
  3. Step 3: Cross multiply
    128.17x = 192.19 × 56
  4. Step 4: Simplify right side
    128.17x = 10,762.64
  5. Step 5: Solve for x
    x = 10,762.64/128.17
  6. Step 6: Final answer
    x = 83.97

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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.