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Finding the Fourth Proportional to 186.90, 257.74 and 121.29

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Solution

The fourth proportional to 186.90, 257.74 and 121.29 is: 167.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.90 : 257.74 = 121.29 : x
  2. Step 2: Convert to fraction form
    186.90/257.74 = 121.29/x
  3. Step 3: Cross multiply
    186.90x = 257.74 × 121.29
  4. Step 4: Simplify right side
    186.90x = 31,261.28
  5. Step 5: Solve for x
    x = 31,261.28/186.90
  6. Step 6: Final answer
    x = 167.26

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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.