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Finding the Fourth Proportional to 778.45, 1,167.78 and 258.27

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Solution

The fourth proportional to 778.45, 1,167.78 and 258.27 is: 387.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.45 : 1,167.78 = 258.27 : x
  2. Step 2: Convert to fraction form
    778.45/1,167.78 = 258.27/x
  3. Step 3: Cross multiply
    778.45x = 1,167.78 × 258.27
  4. Step 4: Simplify right side
    778.45x = 301,602.54
  5. Step 5: Solve for x
    x = 301,602.54/778.45
  6. Step 6: Final answer
    x = 387.44

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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.