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Finding the Fourth Proportional to 186.90, 280.11 and 143.94

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Solution

The fourth proportional to 186.90, 280.11 and 143.94 is: 215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.90 : 280.11 = 143.94 : x
  2. Step 2: Convert to fraction form
    186.90/280.11 = 143.94/x
  3. Step 3: Cross multiply
    186.90x = 280.11 × 143.94
  4. Step 4: Simplify right side
    186.90x = 40,319.03
  5. Step 5: Solve for x
    x = 40,319.03/186.90
  6. Step 6: Final answer
    x = 215.73

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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.