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Finding the Fourth Proportional to 186.91, 257.96 and 113.26

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Solution

The fourth proportional to 186.91, 257.96 and 113.26 is: 156.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.91 : 257.96 = 113.26 : x
  2. Step 2: Convert to fraction form
    186.91/257.96 = 113.26/x
  3. Step 3: Cross multiply
    186.91x = 257.96 × 113.26
  4. Step 4: Simplify right side
    186.91x = 29,215.98
  5. Step 5: Solve for x
    x = 29,215.98/186.91
  6. Step 6: Final answer
    x = 156.31

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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.