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Finding the Fourth Proportional to 422.62, 583.14 and 256.78

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Solution

The fourth proportional to 422.62, 583.14 and 256.78 is: 354.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.62 : 583.14 = 256.78 : x
  2. Step 2: Convert to fraction form
    422.62/583.14 = 256.78/x
  3. Step 3: Cross multiply
    422.62x = 583.14 × 256.78
  4. Step 4: Simplify right side
    422.62x = 149,738.69
  5. Step 5: Solve for x
    x = 149,738.69/422.62
  6. Step 6: Final answer
    x = 354.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.