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Finding the Fourth Proportional to 128, 191.73 and 95.53

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Solution

The fourth proportional to 128, 191.73 and 95.53 is: 143.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 191.73 = 95.53 : x
  2. Step 2: Convert to fraction form
    128/191.73 = 95.53/x
  3. Step 3: Cross multiply
    128x = 191.73 × 95.53
  4. Step 4: Simplify right side
    128x = 18,315.97
  5. Step 5: Solve for x
    x = 18,315.97/128
  6. Step 6: Final answer
    x = 143.09

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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.