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Finding the Fourth Proportional to 855.21, 1,282.87 and 270.23

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Solution

The fourth proportional to 855.21, 1,282.87 and 270.23 is: 405.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.21 : 1,282.87 = 270.23 : x
  2. Step 2: Convert to fraction form
    855.21/1,282.87 = 270.23/x
  3. Step 3: Cross multiply
    855.21x = 1,282.87 × 270.23
  4. Step 4: Simplify right side
    855.21x = 346,669.96
  5. Step 5: Solve for x
    x = 346,669.96/855.21
  6. Step 6: Final answer
    x = 405.36

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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.