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Finding the Fourth Proportional to 186.90, 257.76 and 113.19

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Solution

The fourth proportional to 186.90, 257.76 and 113.19 is: 156.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.90 : 257.76 = 113.19 : x
  2. Step 2: Convert to fraction form
    186.90/257.76 = 113.19/x
  3. Step 3: Cross multiply
    186.90x = 257.76 × 113.19
  4. Step 4: Simplify right side
    186.90x = 29,175.85
  5. Step 5: Solve for x
    x = 29,175.85/186.90
  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.