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Finding the Fourth Proportional to 855.94, 1,283.11 and 779.86

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Solution

The fourth proportional to 855.94, 1,283.11 and 779.86 is: 1,169.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.94 : 1,283.11 = 779.86 : x
  2. Step 2: Convert to fraction form
    855.94/1,283.11 = 779.86/x
  3. Step 3: Cross multiply
    855.94x = 1,283.11 × 779.86
  4. Step 4: Simplify right side
    855.94x = 1,000,646.16
  5. Step 5: Solve for x
    x = 1,000,646.16/855.94
  6. Step 6: Final answer
    x = 1,169.06

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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.