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Finding the Fourth Proportional to 858.36, 1,286.82 and 345.08

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Solution

The fourth proportional to 858.36, 1,286.82 and 345.08 is: 517.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.36 : 1,286.82 = 345.08 : x
  2. Step 2: Convert to fraction form
    858.36/1,286.82 = 345.08/x
  3. Step 3: Cross multiply
    858.36x = 1,286.82 × 345.08
  4. Step 4: Simplify right side
    858.36x = 444,055.85
  5. Step 5: Solve for x
    x = 444,055.85/858.36
  6. Step 6: Final answer
    x = 517.33

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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.