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Finding the Fourth Proportional to 855, 1,282.80 and 422.46

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Solution

The fourth proportional to 855, 1,282.80 and 422.46 is: 633.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    855 : 1,282.80 = 422.46 : x
  2. Step 2: Convert to fraction form
    855/1,282.80 = 422.46/x
  3. Step 3: Cross multiply
    855x = 1,282.80 × 422.46
  4. Step 4: Simplify right side
    855x = 541,931.69
  5. Step 5: Solve for x
    x = 541,931.69/855
  6. Step 6: Final answer
    x = 633.84

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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.