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Finding the Fourth Proportional to 191.33, 285.21 and 188.36

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Solution

The fourth proportional to 191.33, 285.21 and 188.36 is: 280.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.33 : 285.21 = 188.36 : x
  2. Step 2: Convert to fraction form
    191.33/285.21 = 188.36/x
  3. Step 3: Cross multiply
    191.33x = 285.21 × 188.36
  4. Step 4: Simplify right side
    191.33x = 53,720.73
  5. Step 5: Solve for x
    x = 53,720.73/191.33
  6. Step 6: Final answer
    x = 280.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.