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Finding the Fourth Proportional to 855.99, 1,282.37 and 423.45

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Solution

The fourth proportional to 855.99, 1,282.37 and 423.45 is: 634.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.99 : 1,282.37 = 423.45 : x
  2. Step 2: Convert to fraction form
    855.99/1,282.37 = 423.45/x
  3. Step 3: Cross multiply
    855.99x = 1,282.37 × 423.45
  4. Step 4: Simplify right side
    855.99x = 543,017.46
  5. Step 5: Solve for x
    x = 543,017.46/855.99
  6. Step 6: Final answer
    x = 634.37

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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.