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Finding the Fourth Proportional to 855.94, 1,283 and 422.18

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Solution

The fourth proportional to 855.94, 1,283 and 422.18 is: 632.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.94 : 1,283 = 422.18 : x
  2. Step 2: Convert to fraction form
    855.94/1,283 = 422.18/x
  3. Step 3: Cross multiply
    855.94x = 1,283 × 422.18
  4. Step 4: Simplify right side
    855.94x = 541,656.94
  5. Step 5: Solve for x
    x = 541,656.94/855.94
  6. Step 6: Final answer
    x = 632.82

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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.