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Finding the Fourth Proportional to 165.38, 248.13 and 78.71

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Solution

The fourth proportional to 165.38, 248.13 and 78.71 is: 118.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.38 : 248.13 = 78.71 : x
  2. Step 2: Convert to fraction form
    165.38/248.13 = 78.71/x
  3. Step 3: Cross multiply
    165.38x = 248.13 × 78.71
  4. Step 4: Simplify right side
    165.38x = 19,529.07
  5. Step 5: Solve for x
    x = 19,529.07/165.38
  6. Step 6: Final answer
    x = 118.09

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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.