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Finding the Fourth Proportional to 855.12, 1,282.95 and 421.97

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Solution

The fourth proportional to 855.12, 1,282.95 and 421.97 is: 633.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.12 : 1,282.95 = 421.97 : x
  2. Step 2: Convert to fraction form
    855.12/1,282.95 = 421.97/x
  3. Step 3: Cross multiply
    855.12x = 1,282.95 × 421.97
  4. Step 4: Simplify right side
    855.12x = 541,366.41
  5. Step 5: Solve for x
    x = 541,366.41/855.12
  6. Step 6: Final answer
    x = 633.09

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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.