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Finding the Fourth Proportional to 128.67, 193.14 and 73.83

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Solution

The fourth proportional to 128.67, 193.14 and 73.83 is: 110.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.67 : 193.14 = 73.83 : x
  2. Step 2: Convert to fraction form
    128.67/193.14 = 73.83/x
  3. Step 3: Cross multiply
    128.67x = 193.14 × 73.83
  4. Step 4: Simplify right side
    128.67x = 14,259.53
  5. Step 5: Solve for x
    x = 14,259.53/128.67
  6. Step 6: Final answer
    x = 110.82

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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.