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Finding the Fourth Proportional to 855.90, 1,179.90 and 838.35

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Solution

The fourth proportional to 855.90, 1,179.90 and 838.35 is: 1,155.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.90 : 1,179.90 = 838.35 : x
  2. Step 2: Convert to fraction form
    855.90/1,179.90 = 838.35/x
  3. Step 3: Cross multiply
    855.90x = 1,179.90 × 838.35
  4. Step 4: Simplify right side
    855.90x = 989,169.17
  5. Step 5: Solve for x
    x = 989,169.17/855.90
  6. Step 6: Final answer
    x = 1,155.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.