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Finding the Fourth Proportional to 186.67, 257.47 and 120.29

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Solution

The fourth proportional to 186.67, 257.47 and 120.29 is: 165.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.67 : 257.47 = 120.29 : x
  2. Step 2: Convert to fraction form
    186.67/257.47 = 120.29/x
  3. Step 3: Cross multiply
    186.67x = 257.47 × 120.29
  4. Step 4: Simplify right side
    186.67x = 30,969.48
  5. Step 5: Solve for x
    x = 30,969.48/186.67
  6. Step 6: Final answer
    x = 165.91

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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.