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Finding the Fourth Proportional to 186.87, 280.09 and 89.29

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Solution

The fourth proportional to 186.87, 280.09 and 89.29 is: 133.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.87 : 280.09 = 89.29 : x
  2. Step 2: Convert to fraction form
    186.87/280.09 = 89.29/x
  3. Step 3: Cross multiply
    186.87x = 280.09 × 89.29
  4. Step 4: Simplify right side
    186.87x = 25,008.31
  5. Step 5: Solve for x
    x = 25,008.31/186.87
  6. Step 6: Final answer
    x = 133.83

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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.