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Finding the Fourth Proportional to 128.28, 192.65 and 67.53

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Solution

The fourth proportional to 128.28, 192.65 and 67.53 is: 101.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.28 : 192.65 = 67.53 : x
  2. Step 2: Convert to fraction form
    128.28/192.65 = 67.53/x
  3. Step 3: Cross multiply
    128.28x = 192.65 × 67.53
  4. Step 4: Simplify right side
    128.28x = 13,009.65
  5. Step 5: Solve for x
    x = 13,009.65/128.28
  6. Step 6: Final answer
    x = 101.42

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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.