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Finding the Fourth Proportional to 128.16, 191.84 and 73.92

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Solution

The fourth proportional to 128.16, 191.84 and 73.92 is: 110.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.16 : 191.84 = 73.92 : x
  2. Step 2: Convert to fraction form
    128.16/191.84 = 73.92/x
  3. Step 3: Cross multiply
    128.16x = 191.84 × 73.92
  4. Step 4: Simplify right side
    128.16x = 14,180.81
  5. Step 5: Solve for x
    x = 14,180.81/128.16
  6. Step 6: Final answer
    x = 110.65

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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.