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Finding the Fourth Proportional to 422.71, 583.38 and 256.93

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Solution

The fourth proportional to 422.71, 583.38 and 256.93 is: 354.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.71 : 583.38 = 256.93 : x
  2. Step 2: Convert to fraction form
    422.71/583.38 = 256.93/x
  3. Step 3: Cross multiply
    422.71x = 583.38 × 256.93
  4. Step 4: Simplify right side
    422.71x = 149,887.82
  5. Step 5: Solve for x
    x = 149,887.82/422.71
  6. Step 6: Final answer
    x = 354.59

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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.