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Finding the Fourth Proportional to 186.11, 279.30 and 128.18

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Solution

The fourth proportional to 186.11, 279.30 and 128.18 is: 192.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.11 : 279.30 = 128.18 : x
  2. Step 2: Convert to fraction form
    186.11/279.30 = 128.18/x
  3. Step 3: Cross multiply
    186.11x = 279.30 × 128.18
  4. Step 4: Simplify right side
    186.11x = 35,800.67
  5. Step 5: Solve for x
    x = 35,800.67/186.11
  6. Step 6: Final answer
    x = 192.36

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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.