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Finding the Fourth Proportional to 186.31, 279.01 and 109.11

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Solution

The fourth proportional to 186.31, 279.01 and 109.11 is: 163.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.31 : 279.01 = 109.11 : x
  2. Step 2: Convert to fraction form
    186.31/279.01 = 109.11/x
  3. Step 3: Cross multiply
    186.31x = 279.01 × 109.11
  4. Step 4: Simplify right side
    186.31x = 30,442.78
  5. Step 5: Solve for x
    x = 30,442.78/186.31
  6. Step 6: Final answer
    x = 163.40

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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.