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Finding the Fourth Proportional to 422.71, 583.18 and 256.86

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Solution

The fourth proportional to 422.71, 583.18 and 256.86 is: 354.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.71 : 583.18 = 256.86 : x
  2. Step 2: Convert to fraction form
    422.71/583.18 = 256.86/x
  3. Step 3: Cross multiply
    422.71x = 583.18 × 256.86
  4. Step 4: Simplify right side
    422.71x = 149,795.61
  5. Step 5: Solve for x
    x = 149,795.61/422.71
  6. Step 6: Final answer
    x = 354.37

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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.