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Finding the Fourth Proportional to 186.96, 257.94 and 120.58

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Solution

The fourth proportional to 186.96, 257.94 and 120.58 is: 166.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.96 : 257.94 = 120.58 : x
  2. Step 2: Convert to fraction form
    186.96/257.94 = 120.58/x
  3. Step 3: Cross multiply
    186.96x = 257.94 × 120.58
  4. Step 4: Simplify right side
    186.96x = 31,102.41
  5. Step 5: Solve for x
    x = 31,102.41/186.96
  6. Step 6: Final answer
    x = 166.36

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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.