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Finding the Fourth Proportional to 186.60, 279.90 and 105.39

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Solution

The fourth proportional to 186.60, 279.90 and 105.39 is: 158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.60 : 279.90 = 105.39 : x
  2. Step 2: Convert to fraction form
    186.60/279.90 = 105.39/x
  3. Step 3: Cross multiply
    186.60x = 279.90 × 105.39
  4. Step 4: Simplify right side
    186.60x = 29,498.66
  5. Step 5: Solve for x
    x = 29,498.66/186.60
  6. Step 6: Final answer
    x = 158.09

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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.