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Finding the Fourth Proportional to 855.99, 1,282.81 and 490.01

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Solution

The fourth proportional to 855.99, 1,282.81 and 490.01 is: 734.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.99 : 1,282.81 = 490.01 : x
  2. Step 2: Convert to fraction form
    855.99/1,282.81 = 490.01/x
  3. Step 3: Cross multiply
    855.99x = 1,282.81 × 490.01
  4. Step 4: Simplify right side
    855.99x = 628,589.73
  5. Step 5: Solve for x
    x = 628,589.73/855.99
  6. Step 6: Final answer
    x = 734.34

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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.