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Finding the Fourth Proportional to 186.96, 280.44 and 90.75

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Solution

The fourth proportional to 186.96, 280.44 and 90.75 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.96 : 280.44 = 90.75 : x
  2. Step 2: Convert to fraction form
    186.96/280.44 = 90.75/x
  3. Step 3: Cross multiply
    186.96x = 280.44 × 90.75
  4. Step 4: Simplify right side
    186.96x = 25,449.93
  5. Step 5: Solve for x
    x = 25,449.93/186.96
  6. Step 6: Final answer
    x = 136.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.