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Finding the Fourth Proportional to 186.15, 278.79 and 128.16

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Solution

The fourth proportional to 186.15, 278.79 and 128.16 is: 191.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.15 : 278.79 = 128.16 : x
  2. Step 2: Convert to fraction form
    186.15/278.79 = 128.16/x
  3. Step 3: Cross multiply
    186.15x = 278.79 × 128.16
  4. Step 4: Simplify right side
    186.15x = 35,729.73
  5. Step 5: Solve for x
    x = 35,729.73/186.15
  6. Step 6: Final answer
    x = 191.94

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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.