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Finding the Fourth Proportional to 186.86, 257.81 and 113.14

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Solution

The fourth proportional to 186.86, 257.81 and 113.14 is: 156.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.86 : 257.81 = 113.14 : x
  2. Step 2: Convert to fraction form
    186.86/257.81 = 113.14/x
  3. Step 3: Cross multiply
    186.86x = 257.81 × 113.14
  4. Step 4: Simplify right side
    186.86x = 29,168.62
  5. Step 5: Solve for x
    x = 29,168.62/186.86
  6. Step 6: Final answer
    x = 156.10

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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.