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Finding the Fourth Proportional to 186.42, 256.81 and 131.05

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Solution

The fourth proportional to 186.42, 256.81 and 131.05 is: 180.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.42 : 256.81 = 131.05 : x
  2. Step 2: Convert to fraction form
    186.42/256.81 = 131.05/x
  3. Step 3: Cross multiply
    186.42x = 256.81 × 131.05
  4. Step 4: Simplify right side
    186.42x = 33,654.95
  5. Step 5: Solve for x
    x = 33,654.95/186.42
  6. Step 6: Final answer
    x = 180.53

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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.