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Finding the Fourth Proportional to 808.86, 1,211.82 and 778.86

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Solution

The fourth proportional to 808.86, 1,211.82 and 778.86 is: 1,166.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.86 : 1,211.82 = 778.86 : x
  2. Step 2: Convert to fraction form
    808.86/1,211.82 = 778.86/x
  3. Step 3: Cross multiply
    808.86x = 1,211.82 × 778.86
  4. Step 4: Simplify right side
    808.86x = 943,838.13
  5. Step 5: Solve for x
    x = 943,838.13/808.86
  6. Step 6: Final answer
    x = 1,166.87

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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.