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Finding the Fourth Proportional to 186.84, 280.19 and 71.28

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Solution

The fourth proportional to 186.84, 280.19 and 71.28 is: 106.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.84 : 280.19 = 71.28 : x
  2. Step 2: Convert to fraction form
    186.84/280.19 = 71.28/x
  3. Step 3: Cross multiply
    186.84x = 280.19 × 71.28
  4. Step 4: Simplify right side
    186.84x = 19,971.59
  5. Step 5: Solve for x
    x = 19,971.59/186.84
  6. Step 6: Final answer
    x = 106.89

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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.