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Finding the Fourth Proportional to 186.72, 279.93 and 109.89

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Solution

The fourth proportional to 186.72, 279.93 and 109.89 is: 164.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.72 : 279.93 = 109.89 : x
  2. Step 2: Convert to fraction form
    186.72/279.93 = 109.89/x
  3. Step 3: Cross multiply
    186.72x = 279.93 × 109.89
  4. Step 4: Simplify right side
    186.72x = 30,761.51
  5. Step 5: Solve for x
    x = 30,761.51/186.72
  6. Step 6: Final answer
    x = 164.75

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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.