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Finding the Fourth Proportional to 191.21, 263.50 and 186.81

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Solution

The fourth proportional to 191.21, 263.50 and 186.81 is: 257.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.21 : 263.50 = 186.81 : x
  2. Step 2: Convert to fraction form
    191.21/263.50 = 186.81/x
  3. Step 3: Cross multiply
    191.21x = 263.50 × 186.81
  4. Step 4: Simplify right side
    191.21x = 49,224.03
  5. Step 5: Solve for x
    x = 49,224.03/191.21
  6. Step 6: Final answer
    x = 257.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.