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Finding the Fourth Proportional to 778.05, 1,164.80 and 771.90

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Solution

The fourth proportional to 778.05, 1,164.80 and 771.90 is: 1,155.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.05 : 1,164.80 = 771.90 : x
  2. Step 2: Convert to fraction form
    778.05/1,164.80 = 771.90/x
  3. Step 3: Cross multiply
    778.05x = 1,164.80 × 771.90
  4. Step 4: Simplify right side
    778.05x = 899,112.03
  5. Step 5: Solve for x
    x = 899,112.03/778.05
  6. Step 6: Final answer
    x = 1,155.59

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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.