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Finding the Fourth Proportional to 186.19, 278.85 and 113.89

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Solution

The fourth proportional to 186.19, 278.85 and 113.89 is: 170.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.19 : 278.85 = 113.89 : x
  2. Step 2: Convert to fraction form
    186.19/278.85 = 113.89/x
  3. Step 3: Cross multiply
    186.19x = 278.85 × 113.89
  4. Step 4: Simplify right side
    186.19x = 31,758.23
  5. Step 5: Solve for x
    x = 31,758.23/186.19
  6. Step 6: Final answer
    x = 170.57

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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.