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Finding the Fourth Proportional to 422.49, 583.21 and 256.75

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Solution

The fourth proportional to 422.49, 583.21 and 256.75 is: 354.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.49 : 583.21 = 256.75 : x
  2. Step 2: Convert to fraction form
    422.49/583.21 = 256.75/x
  3. Step 3: Cross multiply
    422.49x = 583.21 × 256.75
  4. Step 4: Simplify right side
    422.49x = 149,738.53
  5. Step 5: Solve for x
    x = 149,738.53/422.49
  6. Step 6: Final answer
    x = 354.42

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1.5x scale

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.