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Finding the Fourth Proportional to 789.91, 1,185.36 and 545.98

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Solution

The fourth proportional to 789.91, 1,185.36 and 545.98 is: 819.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.91 : 1,185.36 = 545.98 : x
  2. Step 2: Convert to fraction form
    789.91/1,185.36 = 545.98/x
  3. Step 3: Cross multiply
    789.91x = 1,185.36 × 545.98
  4. Step 4: Simplify right side
    789.91x = 647,182.85
  5. Step 5: Solve for x
    x = 647,182.85/789.91
  6. Step 6: Final answer
    x = 819.31

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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.