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Finding the Fourth Proportional to 852.08, 1,278.09 and 389.78

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Solution

The fourth proportional to 852.08, 1,278.09 and 389.78 is: 584.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.08 : 1,278.09 = 389.78 : x
  2. Step 2: Convert to fraction form
    852.08/1,278.09 = 389.78/x
  3. Step 3: Cross multiply
    852.08x = 1,278.09 × 389.78
  4. Step 4: Simplify right side
    852.08x = 498,173.92
  5. Step 5: Solve for x
    x = 498,173.92/852.08
  6. Step 6: Final answer
    x = 584.66

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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.