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Finding the Fourth Proportional to 855.45, 1,283.37 and 393.36

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Solution

The fourth proportional to 855.45, 1,283.37 and 393.36 is: 590.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.45 : 1,283.37 = 393.36 : x
  2. Step 2: Convert to fraction form
    855.45/1,283.37 = 393.36/x
  3. Step 3: Cross multiply
    855.45x = 1,283.37 × 393.36
  4. Step 4: Simplify right side
    855.45x = 504,826.42
  5. Step 5: Solve for x
    x = 504,826.42/855.45
  6. Step 6: Final answer
    x = 590.13

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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.