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Finding the Fourth Proportional to 191.36, 287.21 and 75.89

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Solution

The fourth proportional to 191.36, 287.21 and 75.89 is: 113.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.36 : 287.21 = 75.89 : x
  2. Step 2: Convert to fraction form
    191.36/287.21 = 75.89/x
  3. Step 3: Cross multiply
    191.36x = 287.21 × 75.89
  4. Step 4: Simplify right side
    191.36x = 21,796.09
  5. Step 5: Solve for x
    x = 21,796.09/191.36
  6. Step 6: Final answer
    x = 113.90

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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.