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Finding the Fourth Proportional to 128, 191.92 and 67.08

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Solution

The fourth proportional to 128, 191.92 and 67.08 is: 100.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 191.92 = 67.08 : x
  2. Step 2: Convert to fraction form
    128/191.92 = 67.08/x
  3. Step 3: Cross multiply
    128x = 191.92 × 67.08
  4. Step 4: Simplify right side
    128x = 12,873.99
  5. Step 5: Solve for x
    x = 12,873.99/128
  6. Step 6: Final answer
    x = 100.58

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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.