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Finding the Fourth Proportional to 186.42, 279.39 and 70.74

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Solution

The fourth proportional to 186.42, 279.39 and 70.74 is: 106.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.42 : 279.39 = 70.74 : x
  2. Step 2: Convert to fraction form
    186.42/279.39 = 70.74/x
  3. Step 3: Cross multiply
    186.42x = 279.39 × 70.74
  4. Step 4: Simplify right side
    186.42x = 19,764.05
  5. Step 5: Solve for x
    x = 19,764.05/186.42
  6. Step 6: Final answer
    x = 106.02

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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.