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Finding the Fourth Proportional to 858.03, 1,286.27 and 309.83

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Solution

The fourth proportional to 858.03, 1,286.27 and 309.83 is: 464.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.03 : 1,286.27 = 309.83 : x
  2. Step 2: Convert to fraction form
    858.03/1,286.27 = 309.83/x
  3. Step 3: Cross multiply
    858.03x = 1,286.27 × 309.83
  4. Step 4: Simplify right side
    858.03x = 398,525.03
  5. Step 5: Solve for x
    x = 398,525.03/858.03
  6. Step 6: Final answer
    x = 464.47

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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.