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Finding the Fourth Proportional to 851.94, 1,278.36 and 419.04

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Solution

The fourth proportional to 851.94, 1,278.36 and 419.04 is: 628.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.94 : 1,278.36 = 419.04 : x
  2. Step 2: Convert to fraction form
    851.94/1,278.36 = 419.04/x
  3. Step 3: Cross multiply
    851.94x = 1,278.36 × 419.04
  4. Step 4: Simplify right side
    851.94x = 535,683.97
  5. Step 5: Solve for x
    x = 535,683.97/851.94
  6. Step 6: Final answer
    x = 628.78

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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.