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Finding the Fourth Proportional to 851.27, 1,275.11 and 389.43

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Solution

The fourth proportional to 851.27, 1,275.11 and 389.43 is: 583.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.27 : 1,275.11 = 389.43 : x
  2. Step 2: Convert to fraction form
    851.27/1,275.11 = 389.43/x
  3. Step 3: Cross multiply
    851.27x = 1,275.11 × 389.43
  4. Step 4: Simplify right side
    851.27x = 496,568.92
  5. Step 5: Solve for x
    x = 496,568.92/851.27
  6. Step 6: Final answer
    x = 583.33

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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.