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Finding the Fourth Proportional to 186.19, 279.42 and 138.40

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Solution

The fourth proportional to 186.19, 279.42 and 138.40 is: 207.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.19 : 279.42 = 138.40 : x
  2. Step 2: Convert to fraction form
    186.19/279.42 = 138.40/x
  3. Step 3: Cross multiply
    186.19x = 279.42 × 138.40
  4. Step 4: Simplify right side
    186.19x = 38,671.73
  5. Step 5: Solve for x
    x = 38,671.73/186.19
  6. Step 6: Final answer
    x = 207.70

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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.