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Finding the Fourth Proportional to 263.96, 395.91 and 78.87

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Solution

The fourth proportional to 263.96, 395.91 and 78.87 is: 118.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.96 : 395.91 = 78.87 : x
  2. Step 2: Convert to fraction form
    263.96/395.91 = 78.87/x
  3. Step 3: Cross multiply
    263.96x = 395.91 × 78.87
  4. Step 4: Simplify right side
    263.96x = 31,225.42
  5. Step 5: Solve for x
    x = 31,225.42/263.96
  6. Step 6: Final answer
    x = 118.30

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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.