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Finding the Fourth Proportional to 263.78, 395.73 and 78.69

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Solution

The fourth proportional to 263.78, 395.73 and 78.69 is: 118.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.78 : 395.73 = 78.69 : x
  2. Step 2: Convert to fraction form
    263.78/395.73 = 78.69/x
  3. Step 3: Cross multiply
    263.78x = 395.73 × 78.69
  4. Step 4: Simplify right side
    263.78x = 31,139.99
  5. Step 5: Solve for x
    x = 31,139.99/263.78
  6. Step 6: Final answer
    x = 118.06

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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.