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Finding the Fourth Proportional to 855.36, 1,282.26 and 307.38

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Solution

The fourth proportional to 855.36, 1,282.26 and 307.38 is: 460.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.36 : 1,282.26 = 307.38 : x
  2. Step 2: Convert to fraction form
    855.36/1,282.26 = 307.38/x
  3. Step 3: Cross multiply
    855.36x = 1,282.26 × 307.38
  4. Step 4: Simplify right side
    855.36x = 394,141.08
  5. Step 5: Solve for x
    x = 394,141.08/855.36
  6. Step 6: Final answer
    x = 460.79

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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.