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Finding the Fourth Proportional to 858.29, 1,286.33 and 389.42

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Solution

The fourth proportional to 858.29, 1,286.33 and 389.42 is: 583.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.29 : 1,286.33 = 389.42 : x
  2. Step 2: Convert to fraction form
    858.29/1,286.33 = 389.42/x
  3. Step 3: Cross multiply
    858.29x = 1,286.33 × 389.42
  4. Step 4: Simplify right side
    858.29x = 500,922.63
  5. Step 5: Solve for x
    x = 500,922.63/858.29
  6. Step 6: Final answer
    x = 583.63

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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.