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Finding the Fourth Proportional to 128, 191.88 and 73.88

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Solution

The fourth proportional to 128, 191.88 and 73.88 is: 110.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 191.88 = 73.88 : x
  2. Step 2: Convert to fraction form
    128/191.88 = 73.88/x
  3. Step 3: Cross multiply
    128x = 191.88 × 73.88
  4. Step 4: Simplify right side
    128x = 14,176.09
  5. Step 5: Solve for x
    x = 14,176.09/128
  6. Step 6: Final answer
    x = 110.75

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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.