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Finding the Fourth Proportional to 186.96, 257.84 and 113.20

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Solution

The fourth proportional to 186.96, 257.84 and 113.20 is: 156.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.96 : 257.84 = 113.20 : x
  2. Step 2: Convert to fraction form
    186.96/257.84 = 113.20/x
  3. Step 3: Cross multiply
    186.96x = 257.84 × 113.20
  4. Step 4: Simplify right side
    186.96x = 29,187.49
  5. Step 5: Solve for x
    x = 29,187.49/186.96
  6. Step 6: Final answer
    x = 156.12

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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.