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Finding the Fourth Proportional to 186.85, 280 and 84.07

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Solution

The fourth proportional to 186.85, 280 and 84.07 is: 125.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.85 : 280 = 84.07 : x
  2. Step 2: Convert to fraction form
    186.85/280 = 84.07/x
  3. Step 3: Cross multiply
    186.85x = 280 × 84.07
  4. Step 4: Simplify right side
    186.85x = 23,539.60
  5. Step 5: Solve for x
    x = 23,539.60/186.85
  6. Step 6: Final answer
    x = 125.98

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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.