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Finding the Fourth Proportional to 186.32, 279.27 and 128.56

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Solution

The fourth proportional to 186.32, 279.27 and 128.56 is: 192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.32 : 279.27 = 128.56 : x
  2. Step 2: Convert to fraction form
    186.32/279.27 = 128.56/x
  3. Step 3: Cross multiply
    186.32x = 279.27 × 128.56
  4. Step 4: Simplify right side
    186.32x = 35,902.31
  5. Step 5: Solve for x
    x = 35,902.31/186.32
  6. Step 6: Final answer
    x = 192.70

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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.