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Finding the Fourth Proportional to 186.18, 255.90 and 149.28

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Solution

The fourth proportional to 186.18, 255.90 and 149.28 is: 205.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.18 : 255.90 = 149.28 : x
  2. Step 2: Convert to fraction form
    186.18/255.90 = 149.28/x
  3. Step 3: Cross multiply
    186.18x = 255.90 × 149.28
  4. Step 4: Simplify right side
    186.18x = 38,200.75
  5. Step 5: Solve for x
    x = 38,200.75/186.18
  6. Step 6: Final answer
    x = 205.18

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.