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Finding the Fourth Proportional to 186.90, 257.91 and 113.20

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Solution

The fourth proportional to 186.90, 257.91 and 113.20 is: 156.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.90 : 257.91 = 113.20 : x
  2. Step 2: Convert to fraction form
    186.90/257.91 = 113.20/x
  3. Step 3: Cross multiply
    186.90x = 257.91 × 113.20
  4. Step 4: Simplify right side
    186.90x = 29,195.41
  5. Step 5: Solve for x
    x = 29,195.41/186.90
  6. Step 6: Final answer
    x = 156.21

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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.