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Finding the Fourth Proportional to 422.24, 582.48 and 256.40

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Solution

The fourth proportional to 422.24, 582.48 and 256.40 is: 353.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.24 : 582.48 = 256.40 : x
  2. Step 2: Convert to fraction form
    422.24/582.48 = 256.40/x
  3. Step 3: Cross multiply
    422.24x = 582.48 × 256.40
  4. Step 4: Simplify right side
    422.24x = 149,347.87
  5. Step 5: Solve for x
    x = 149,347.87/422.24
  6. Step 6: Final answer
    x = 353.70

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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.