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Finding the Fourth Proportional to 186.84, 257.89 and 121.34

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Solution

The fourth proportional to 186.84, 257.89 and 121.34 is: 167.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.84 : 257.89 = 121.34 : x
  2. Step 2: Convert to fraction form
    186.84/257.89 = 121.34/x
  3. Step 3: Cross multiply
    186.84x = 257.89 × 121.34
  4. Step 4: Simplify right side
    186.84x = 31,292.37
  5. Step 5: Solve for x
    x = 31,292.37/186.84
  6. Step 6: Final answer
    x = 167.48

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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.