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Finding the Fourth Proportional to 186.78, 257.34 and 131.43

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Solution

The fourth proportional to 186.78, 257.34 and 131.43 is: 181.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.78 : 257.34 = 131.43 : x
  2. Step 2: Convert to fraction form
    186.78/257.34 = 131.43/x
  3. Step 3: Cross multiply
    186.78x = 257.34 × 131.43
  4. Step 4: Simplify right side
    186.78x = 33,822.20
  5. Step 5: Solve for x
    x = 33,822.20/186.78
  6. Step 6: Final answer
    x = 181.08

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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.