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Finding the Fourth Proportional to 186.51, 279.92 and 78.38

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Solution

The fourth proportional to 186.51, 279.92 and 78.38 is: 117.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.51 : 279.92 = 78.38 : x
  2. Step 2: Convert to fraction form
    186.51/279.92 = 78.38/x
  3. Step 3: Cross multiply
    186.51x = 279.92 × 78.38
  4. Step 4: Simplify right side
    186.51x = 21,939.98
  5. Step 5: Solve for x
    x = 21,939.98/186.51
  6. Step 6: Final answer
    x = 117.63

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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.